Highter Than Nornal Idle Due to Vacuum Leak on Chevrolet G Series Van (G20)

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

RepairPal Verified
Average mileage: 166,000 (157,000–175,000)
Engines affected: 4.3L V6, 5.7L V8, Gasoline
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
8 people reported this problem
1 person shared problem details
1990 Chevrolet G Series Van (G20)- 5.7L V8175,000
same prob very high idle. spray injector cleaner around the base of the TB the Idle will slow down ,The base gasket is bad change gasket its under $4
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Slow leak at times. Interested in repair shop in Biloxi/Gulport, Mississippi

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