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Engine stutters under load

Tiny
MRTUFLE
  • MEMBER
  • 2012 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 14,300 MILES
I been having this problem ever since I purchased the car its stutters and under load meaning with the AC on. When you turning a corner it acts like it wants to stall out at low speeds. I have changed the mass air flow sensor to Delphi and changed the throttle body ACDelco changed plugs ACDelco. Changed all four oxygen sensors Denso. No check engine light is on. The throttle body has been reprogrammed. I had it put on the scanner and everything is where it needs to be. Please help.
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Monday, May 7th, 2018 AT 10:15 AM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

What about the ignition parts? Plugs? That will cause your issue.

Also, did you have the fuel pressure tested?

Are you sure it is the engine and not transmission related?

Roy
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Monday, May 7th, 2018 AT 2:21 PM
Tiny
MRTUFLE
  • MEMBER
  • 9 POSTS
I changed the spark plugs already ACDelco and I bought a throttle body ACDelco and had it programmed and the mechanic took a look at all the readings and nothing seemed to be out of range. I know it is not the transmission it does not act up. The car does the stutter with the AC off but just not as bad with the AC on.
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Monday, May 7th, 2018 AT 2:35 PM
Tiny
MRTUFLE
  • MEMBER
  • 9 POSTS
I have not had it fuel pressure tested yet.
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Monday, May 7th, 2018 AT 2:38 PM
Tiny
MRTUFLE
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  • 9 POSTS
And I have not changed any coils.
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Monday, May 7th, 2018 AT 2:39 PM
Tiny
MRTUFLE
  • MEMBER
  • 9 POSTS
Remind you no check engine light is on.
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Monday, May 7th, 2018 AT 2:40 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Not worried about the check engine light. That just means it is mechanical.

The reason I ask about the transmission is there is a common issue with torque converter shutter. That is when the clutches slip in the converter making it feel like it is an engine issue.

Roy
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Monday, May 7th, 2018 AT 2:48 PM
Tiny
MRTUFLE
  • MEMBER
  • 9 POSTS
Hmm, was not aware of that. This is my first Tahoe so I am not really familiarized with the vehicle yet. How can I know for sure if it is the transmission causing this effect?
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Monday, May 7th, 2018 AT 3:32 PM
Tiny
MRTUFLE
  • MEMBER
  • 9 POSTS
It has the 5.3l engine by the way. Will this effect take place while I am taking a corner? I have to press on the gas pedal and it does not respond. I almost have to press it all the way down to come out of the shutter it almost seems like it is going to shut off.
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Monday, May 7th, 2018 AT 3:36 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Yes.

The best way to confirm is to let someone drive it who is familiar with the transmission.

Roy
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Monday, May 7th, 2018 AT 3:41 PM
Tiny
MRTUFLE
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  • 9 POSTS
Okay.
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Monday, May 7th, 2018 AT 3:42 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Keep us updated.
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Monday, May 7th, 2018 AT 3:56 PM

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