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Acceleration problems

Tiny
RODNEY CAR CARE
  • MEMBER
  • 2003 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
The car sounds rough when I start it, when I take off it it moves slow (creep) then just kicks in and rides smooth, it never goes above 30 mph and if I try to push it pass 30 mph it start to shake like it wants to cut off. I have changed the coil pack, the cam censor, and the acceleration pedal. Still no change, please help me.
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Monday, February 4th, 2019 AT 6:44 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

It sounds like you are in limp mode due to a dirty throttle bore. Here is a guide to help us fix the problem:

https://www.2carpros.com/articles/reduced-power-limp-mode

We should run the codes as well.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.
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Tuesday, February 5th, 2019 AT 11:36 AM

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