What causes high rpms when idling?
When I start my 02 Ford Explorer my rpms shoot high then idles real low then goes high then low repeatedly and when trying to put it in drive engine shuts off… Could it do with anything with my catalytic converter or is it my O2 sensor or maybe a vaccum leak?
Less friction than when you're moving a water is pushing against it from the front. I think thats my best guess.
Could be a vacuum leak or it could be the throttle position sensor failing.
IAC (idle air control) sometimes called ISC (idle speed control) is a small valve that controls idle speed by amount of air allowed at idle. When they go bad the symptoms are just what you describe.
Throttle body sticking maybe, or might need some adjustments.
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