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Chevrolet G Series Van (G20) Idling Problems Due to Vacuum Leak in Throttle Body Gasket

 
Chevrolet G Series Van (G20) Problem
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Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995

Engines Affected: 4.3L V6, 5.7L V8, Gasoline

Average Mileage: 166,000 mi (157,000 mi - 175,000 mi)

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

  • Visitor, , 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

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