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First check your throttle body sensor and then your (iac) motor. Last but not least it could be your plenum gasket or a leak in your vacuum system

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Q: What could be the cause No engine light but car idles high?
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Can service light cause uneven idling?

No, but something that could cause uneven idle could cause the check engine light to turn on.No, but something that could cause uneven idle could cause the check engine light to turn on.


Why does my check engine light and temp light flash on and off and speedometer drops and idles rough in my 1990 olds calais?

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Will installing a thermostat backwards make problems with check engine light?

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Check light has come on and cars idles just over 1000rpm any ideas what may be causing it?

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