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Q: Engine speeds up and down. on 2001 Ford Mustang

Engine seems to speed up and slow down even after it warms up. I read somewhere that something dealing with the throttle body needed removing and cleaning with carburator cleaner. Can anyone explain exactly what needs to be done?
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the deposits at the throttlr plate can cause this kind of issue
more than that, the idle air valve is a more common failure. have it check for operation.

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