GMC 3500 Pickup Problem Report

GMC 3500 Pickup Highter Than Nornal Idle Due to Vacuum Leak

(6 reports)

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

When you start the truck, the idle goes high, and when I put in drive, it comes to normal!! What that could be? -
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