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Highter Than Nornal Idle Due to Vacuum Leak on GMC Rally Wagon 3500

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: (–)
Engine affected: Gasoline
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
6 people reported this problem