Engine idles high

Old 11-07-2018, 02:33 PM
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Engine idles high

2000 F150 6 Cylinder
Engine takes a long time to idle down after reving. If I turn the air conditioner on, it seems to idle down but not every time. The engine idles down but not right after I lift off the gas. Any idea would be appreciated. Thanks

Last edited by robert53; 11-07-2018 at 02:35 PM.
Old 11-07-2018, 03:01 PM
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Either a vacuum leak or a sticky IAC valve.
Old 11-07-2018, 03:21 PM
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Could also be a binding throttle, linkage, or cable.

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