Question about 1991 Cadillac DeVille

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THE 90 CADI DEVILLE IS IDLING TO HIGH HOW DO I ADJUST

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There is no adjustment, if it's idling too high you most likely have a vacuum leak. Check the vacuum hoses for splits or breaks it could also be the throttle body base gasket. There should also be a idle air control valve which could be defective. But, I'd look and listen for a leak first.

Posted on Nov 18, 2009

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