Idles high in park

Asked by Feb 17, 2014 at 08:41 PM about the 1999 Chevrolet Silverado 1500 3 Dr STD 4WD Extended Cab LB

Question type: Maintenance & Repair

In addition to my first question. I forgot to add I changed out the throttle positions
sensor and idle air control valve multiple times. Still idles high?

1 Answer

Un-metered air entering intake manifold. i.e. vacuum leak.

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