My 91 cutlass ciera has a problem with a high idle.
Once you've reached a stop and release the brakes,
without accelerating or hitting the gas pedal the
car will reach a 30mph on its own.
Sounds like a vacuum leak or bad IAC (Idle Air Control) valve. Is the check engine or service engine soon light on? HTH. -Jim
No service engine light.
Then check for a faulty IAC. A vacuum leak would trigger the service engine soon light. Also, check for a binding throttle cable that's not allowing the throttle to close all the way. HTH. -Jim
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