G Series Van (G20)

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

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: 146,500 (125,000–175,000)
Engines affected: 4.3L V6, 5.0L V8, 5.7L V8, Gasoline
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
11 people reported this problem
Viewing 1 - 2 of 2 comments
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