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1995 Chevy Truck stumbles in parking lot and at stops

Tiny
SUZUKI-GUY
  • MEMBER
  • 1995 CHEVROLET TRUCK
  • V8
  • 4WD
  • MANUAL
  • 130,000 MILES
OK bare with me my truck when I am in a parking lot or coming to a stop will stumble like its going to stall but never does. Ive tried everything I need your help! First of all no check engine light. Ive replaced EGR valve and solenoid, MAP sensor, temperature sensor, fuel filter, injectors, pressure regulater, purge valve, vacuum lines, ignition module, plugs, wires, cap and rotor, new intake manifold gaskets, resurfaced heads and did a valve grind, new CAT convertor, new rockers, compression 125 to 130 all around, new fuel inlet and outlet gaskets and o rings, new TBI gasket, new TPS sensor. Im telling you guys ive tried everything! I nee dyour help
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Friday, April 17th, 2009 AT 3:26 AM

10 Replies

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
You can try some throttle body cleaner and spray it in the throttle body. There may be a build up of carbon inside. I am not sure if this will fix it but It would nopt hurt to try.
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Friday, April 17th, 2009 AT 9:16 AM
Tiny
SUZUKI-GUY
  • MEMBER
  • 6 POSTS
I already tried this I ran Sea foam through it
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Friday, April 17th, 2009 AT 4:00 PM
Tiny
DCS1998
  • MEMBER
  • 41 POSTS
WOW
If it was me, I would be checking to make sure the "Check Engine" lite was in working order.
Thats an awful lot of things that you have replaced and still having issues.

I would clear and then re-scan the codes if it was me.
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Friday, April 17th, 2009 AT 5:22 PM
Tiny
SUZUKI-GUY
  • MEMBER
  • 6 POSTS
I have already tried resetting my computer and rechecking codes the light works. It does have an aftermarket hypertech chip could that be the problem? I tried putting the stock chip in but it gave me an error code and wouldnt start. Its getting worse could a fuel pump be the problem? Its been going on for a year seams like fuel pump would of gone bad by now
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Friday, April 17th, 2009 AT 6:34 PM
Tiny
DCS1998
  • MEMBER
  • 41 POSTS
In the great words of most of the "2carpros"techs here. Check the fuel pressure and let ol' M_J_RITZEL know what your readings are. These guys are very good at what they do.
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Friday, April 17th, 2009 AT 6:41 PM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Try this, disconnect the positive without hooking it up touch the positive connection to the ground cable. This will let any voltage to be grounded out. And you only have to do it for a few seconds. Don't hook the positve side up to the battery yet. Then remove the hyperchip and put the stock one in, then after everythingis changed hook the positive side back up. This will clear all codes. Then you should be able to start the truck. The truck will have to be driven about 50 miles until the computer completly resets.
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Friday, April 17th, 2009 AT 9:36 PM
Tiny
SUZUKI-GUY
  • MEMBER
  • 6 POSTS
MMk I am now leaning toward Bad ECM Is there a way to test it? If not I am just going to buy one there only 76 dollars new. My question is does it matter what transmiision I have? Or just motor? Do I just Plug it in and put my old prom chip in? Thanks guys
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Monday, June 1st, 2009 AT 6:42 PM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Make sure its the ecm first you say you put the standard chip in, After you did you reset the computer. Or is it still reading the hyperchip. Try the old one again but disconnect the battery while you do it. When they give instructions on putting the hyperchip in they say ground yourself so there is no static electricity between you and the ecm. If it still does not start. When you turn the key on do you hear the fuel pump clicking, sometimes it is very faint but you should be able to hear it. Usually when a fuel pump goes it just stops working. Had one go in my 1995 when I was 92 miles from home and had it towed.
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Tuesday, June 2nd, 2009 AT 11:32 PM
Tiny
SUZUKI-GUY
  • MEMBER
  • 6 POSTS
I figured out why the old chip won't work it's because its out of the old 305 motor this ones a 350 that was put in 200,000 miles ago
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Wednesday, June 3rd, 2009 AT 4:21 PM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Maybe may be the problem.
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-1
Wednesday, June 3rd, 2009 AT 5:11 PM

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