Car Problem Reports

GMC 1500 Pickup Idling Problems Due to Vacuum Leak in Throttle Body Gasket

GMC 1500 Pickup Problem
9 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995

Engines Affected: 5.0L V8, 5.7L V8, Gasoline

Average Mileage: 118,900 mi (17,800 mi - 220,000 mi)


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

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