Question about 2000 GMC New Sierra 1500

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2000 gmc rough idle

  1. replaced throttle body gasket , cleaned it . seems it still may leak but carb cleaner sparyed has no effect . dealer said after inpect may be fuel pump? can a throttle body warp?

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  • sassynurse20 Jan 15, 2009

    Same problem, replaced fuel pump, fuel filter, fuel pressure regulator.. still dragging and lagging.. hesitates going down hi way.. wondering if it is the PCM?? or one of the other sensors.. My truck is not throwing codes and engine light not on!! And now, the heater is no longer working..temp gauge at normal temp and blows cold air. 2000 GMC SIERRA 4.2L V-8

  • Glenn Snow May 11, 2010

    Was the TB gasket replaced in course of cleaning or rebuild? Else, what prompted its replacement? It is not likely that the TB would warp. Make sure all electronic control wires are in tact and connected. Does the engine otherwise run normally? Is there symptoms of over fueling?

  • Anonymous Mar 13, 2014

    Would the leak be able to be detected when the Throttle Body De-Carb Service was preformed?



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Im not sure if this can help, but my 2000 gmc sierra was idling badly. Replaced Fuel Pressure Regulator and my truck runs like its brand new. My service engine light was also on.

Posted on Jan 10, 2009


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The engine is idling high around 2500 rpm, I have already replaced the idler air control valve. No vacuum leaks are present.

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