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1993 GMC Sierra Throttle trouble

Tiny
ROGERTAZ2646
  • MEMBER
  • 1993 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Hello my truck is over accelerating burning a lot of gas (basically I can't burn tire) a local mechanic told me I need a new tbi unit but was wondering what else could be causing my problem on my truck
Wednesday, July 30th, 2014 AT 8:17 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
What do you mean by over accelerating? Is the engine revving and you're not accelerating? Have you checked it for trouble codes?
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Wednesday, July 30th, 2014 AT 9:21 PM
Tiny
ROGERTAZ2646
  • MEMBER
  • 2 POSTS
I mean that when I start the truck it sounds like I start it with my foot on the gas petal already and when I put it on reverse or drive it sometimes burn tire and if I let it drive by itself it will go 20mph without my foot on gas petal
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Thursday, July 31st, 2014 AT 5:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Okay, the idle is too high. Have you checked for trouble codes? Have you checked for vacuum leaks? Have you checked the IAC?
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Thursday, July 31st, 2014 AT 9:22 PM

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