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Idle speed fluctuats from day to day. on 1998 Ford Taurus

usually when first started.

Asked by for the 1998 Ford Taurus
Also a common problem,, vacuum leaks! Check pcv system...
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1 more answer
Idle air control valves are know to have high failure rates. Throttle body plates get gummed up and stick. You can try cleaning the throttle body.