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Q:

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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
usually when first started.
(2) Answers
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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.
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