1986 GMC S15 4 cyl starts and runs, but high rpm idle

Asked by GuruG7YRW Sep 01, 2020 at 03:19 PM

Question type: Maintenance & Repair

1986 GMC S15 4 cyl starts and runs smooth but does not idle down after reaching normal operating temperature. Is it the throttle position sensor?

1 Answer
101,815

KenF answered 3 years ago

*maybe*, but a more likely cause is a vacuum leak around the intake.

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