GMC Sierra Engine Idle Erratic

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1997 GMC Sierra Idle/running Problem

1997 GMC SIERRA

Need Some Information, Could Someone Give Me A Description On How A Bad Or Clogged Cat Converter Would Make A Vehicle Run. Thanks. Marc...

1 ANSWER

Asked by mjstrong

1996 GMC SIERRA

My Engine Constantly Idles Back And Forth High And Low. When I Start It, It Starts Up High For About 30 Seconds Before Dropping Down Where...

1 ANSWER

Asked by DANDCCONNELL

1991 GMC SIERRA

Engine Performance Problem 1991 Gmc Sierra 6 Cyl Two Wheel Drive Automatic When I Start My Truck In The Morning During The Hot Weather...

10 ANSWERS

Asked by Murph2

1990 GMC SIERRA

Idle Oscillates From Slow To Fast And If The Throttle Is Opened A Bit It Speeds For About 30 Seconds, Then Backfires Through The Tbi And...

1 ANSWER

Asked by baggypants

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