by walleye on June 7th, 2007

walleye

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91 cavalier 4cyl the engine speeds up and slows down at idle, why?

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Answers. 2 helpful answers below.

  • by odd ball on October 16th, 2007

    odd ball

    could be time for a tune up. When where the last time the spark plugs and cap and rotor were changed? It may be missing at idle, causing the rpm to dip up and down

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  • by DenLorsTools on October 16th, 2007

    DenLorsTools

    Possibly a vacuum leak, listen for hissing under the hood.

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