Engine starts and then stalls while driving?

Tiny
BLUEPITT
  • MEMBER
  • 5 POSTS
  • 2004 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 64,000 MILES
Ok Here We Go I Have A 2004 Silverado With The 5.3 It Is Fly By Wire Throtle Body. The Truck Has Ported Heads, Headers, 4.10 Gears After Market Cam It Had The GM HD Transmition 4l60e In It I Changed The Throttle Body From A 75mm To A 80mm It Ran Fine. Then The Tranny Blew Up It Broke The Output Shaft In Half. So I Took It To The Transmition Shop They Built Me A Transmition With The Shift Kit 5 Planet Gears The Whole 9 Yards. The Converter Was Supost To Be A 2,700 Stall So I Got The Truck Back And The Truck Lacked Power And Was Not Shifting Right So I Bring The Truck Back To The Trans Shop They Tell Me The Reverse Gears Burned Up They Fix The Prob I Tell Them The Converter Is Not Right Does Not Feel Like A Stall Conv. The Converter Is The Same Housing I Had In The Blown Up Trans. So They Change The Converter It Looks Like The Same Sise As The Old One. The Truck Has A Clunking Noise When It Is At Idle And When Stoped And When Restarted Like A Shuter In The FlorBoard Area And Is Even Slower Than The Last Time. So I Bring It Back, The Teck Goes On A Test Drive With Me And Tells Me That He Cant Feel Nuthing Wrong So We Stop At A Light And I Tell Him That I Will Get On It One More Time, When The Light Turns Green I Start To Go And The Truck Just Reevs Up To 3000rpm And Wont Go! So We Tow It Back. They Tell Me The Pump Gear Burned Up So They Replace It. The Converter Is Still Not Staling So I Get My Owne From A Aftermarket Dealer It Is A 9" 2,700 Stall Lock Up Converter. The Converter Noise Goes Away The Tranny Shop Fixes The Tranny I Get The Truck Back And The Stall Is Great But The Truck Surges And Some Times Dies When Applying The Breaks Even When I Coast To A StopThe Tuck Dies After The Lasd Down Shift ( It Does Not Die When It Is Cold)
I Have The Cooling Fan On The DARLE Two Coar Trans Cooler So It Is Not Geting Hot. And When At Speeds Of 30mph Or Greator When I FLOOR The Gas The Truck Starts To Rev Up And Just Cuts All The Way Out For A Split Second Then Catches And Away It Goes Then When I Reach High Speeds And RPM (The Rev Limiter Is Deleted) The Truck Cuts To Like 4cylinders And Says Reduced Engine Power And The Check Eng Light Goes On And The Coad Says The Throttle Pos Is Not Actual. But If I Dont Tromp On It All The Other Problems Are There With No Coads. I Have Checked The Fuell Press. It Is Fine. And When I Rev The Truck Up Slowley It Will Surge Several Times UP DOWN And Die If I Let Off The Gas. And Around 3,000 To 4,000 rpm In Neutral When Pushing The Gas Verry Slowley Down The Rpm Stays The Same Even When Pushing For A Short Moment. HEEELP!
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Problem is either in the throttle body or the gas pedal. I just had a trailblazer with the same code and I flipped the coin and it landed on gas pedal and that fixed it.
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
WILEYCOYOTE13
  • MEMBER
  • 5 POSTS
  • 2004 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 146,500 MILES
After starting my truck from cold or after 20 minutes of cool down, I drive less than few hundred yards and apply brakes to stop or turn, engine runs rough and then dies. Restarts immediately, but it dies again if I let off throttle, while applying brakes. Battery light comes on when engine dies like it should. Please help. I have added an AEM cold air intake and an Air Raid throttle body spacer. No other mods. Ran different brands of octane booster and higher octane fuel through system and seems to run rougher. Thank you, Chris
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Disconnect your maf sensor and see what happends. Do you have a check engine light on?
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
WILEYCOYOTE13
  • MEMBER
  • 5 POSTS
No, check engine light as of yet. What are the possible issues that may arise if the maf is disconnected?
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Nothing, just your check engine light will come on. If the MAF is the problem, with it disconnected you should have plenty of power and no stalling
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
WILEYCOYOTE13
  • MEMBER
  • 5 POSTS
I bought some CRC brand MAF Cleaner and sprayed the sensor, slight improvement. Still stalls, but runs smoother. Have to spend to get it fixed right. Always go cheap first. Thank you for the tips and advice. Wiley coyote!
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Try to disconnect it first before you spray anything into it
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Thursday, September 3rd, 2020 AT 11:49 AM (Merged)
Tiny
TYLER FRIEDLINE
  • MEMBER
  • 2 POSTS
  • 2004 CHEVROLET SILVERADO
  • 0.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
My truck has an intermittent issue. Sometimes it's fine sometimes when I come to a stop it will shut off. Once it shuts off when I restart the truck it will shut off in seconds if I don't give it gas and then when I left off the gas it will shut off again if stopped for more then 5 seconds.
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This sounds like an idle air control issue. Here is a bunch of info on this and let me know if you have questions:

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

https://www.2carpros.com/articles/idle-air-control-valve-service

Basically you holding the throttle open is compensating for the IAC being stuck closed or not open enough. I would suggest removing it and at least cleaning it to see if that makes a difference.

Let me know what you find with this and we can go from there. Thanks
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

I believe it could a possibility of 2 things. First is a weak,faulty, or failing fuel pump that is not providing enough fuel pressure intermittently.If you don't have access to a fuel pressure tester most auto parts stores have a tool loaner program and can rent you one. Here is a tutorial showing what is involved:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The fuel pressure specification for your truck is 55-62 p.s.i. with the key on engine off.

Secondly, Which I'm more leaning towards is the IAC- idle air control valve.Makes a little more sense since your issue always seems to be happening at idle. Here are 2 tutorials for you to view relating to the idle air control valve:

https://www.2carpros.com/articles/idle-air-control-valve-service

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Let me know if you have any further questions on this issue.Hope this helps and thanks for using 2CarPros.
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
TYLER FRIEDLINE
  • MEMBER
  • 2 POSTS
So I replaced the throttle body because the IAC is one part. The truck idles fine now no issues when stopped but the dang thing has now shut off twice but only when making a right turn and it only shuts off for split second then runs fine.
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This sounds like a possible fuel issue. I have found that at times making turns the fuel pump will drop slightly and the engine will cut off. Then run normally except for these random times. So this sounds like Danny's other suggestion so let's check fuel pressure when this is acting up. I would just hook up the gauge and tape it to the windshield so you can drive around with it hooked up and monitor it whenever it acts up.

Let us know what you find and we can go from there. Thanks
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Just curious to know if you've been able to test the fuel pressure to see if it's a possible issue with this symptom.I'm my prior post I included your fuel pressure specification which is 55-62 PSI. For your truck. Keep us updated. We're here to help. Thanks again for using 2CarPros.

Danny-
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
V POHLE
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
Chevy Silverado 2004 8.1 gas engine. Ran well until battery went dead as I left something on in the cab, recharged both batteries and they are staying charged, truck starts right up, but only stays running for 3-5 seconds then shuts off. Checked out alternator working good, high output. Noticed that the charging guage does not advance up however on the dash. Needle moves, but does not go up to 12 or 14v. Don't know what to check next?
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There is a fusible llink that runs off the generator that may be bad. There also is afuse holder near the right battery and a auxillary relay at right rear of eng compartment. Put a volt gauge on your battery and see how may volts it gets while running at about 1500 rpm. Also with 8.1L they tend to loosen the intake bolts so see if they will tighten. But don't be a gorilla as they will break they aren't that big.
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
GARY GEORGE
  • MEMBER
  • 12 POSTS
  • 2004 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 122,000 MILES
I own a 2004 chevy silverado 1500 with a 5.3 liter eng. Recently the eng light came on and it started running really rough like it was going to die. It not only runs rough at idle but also in gear or hesitates when I excelerate from a stop. Ive done countless diagnostics, only to come up with multiple problems it could be. One was a possible blown intake gasket which I replaced and the truck ran fine for a little bit then the eng light came on and started the same thing. I also bought the 2 before cat oxygen sensors but havent installed the yet. Can anyone tell me what to look for or try from here?
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Let's start with what are the exact code number's you have?If you tell me those I can help you out.
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+1
Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
GARY GEORGE
  • MEMBER
  • 12 POSTS
P0131, p0171, p0300 these are the codes that I have.
Thank You, Gary
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)
Tiny
GARY GEORGE
  • MEMBER
  • 12 POSTS
These are the codes that I have P0131, P0171, P0300
Thanks, Gary
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Thursday, September 3rd, 2020 AT 11:50 AM (Merged)

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