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.

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Average mileage: 146,500 (125,000–175,000)
Engines affected: 4.3L V6, 5.7L V8, Gasoline
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
10 people reported this problem
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1990 Chevrolet G Series Van (G20) - 5.7L V8 175,000 mi,
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