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I have a 2001 Toyota Corolla. The revs fluctuate whilst idling.

When the engine runs idle the revs go up and down between 500RPM and 900RPM, then when I go to pull away the revs drop and it almost stalls. If I give it just a little more throttle it over revs. What's causing this?

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Could be a bad TPS or stuck, bad, dirty idle air control solenoid (IAC). check fuel pressure and check for vacuum leaks after the air flow sensor. more info is needed because what you describe could be many different things or a combo of different things

Posted on Apr 01, 2014

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