2001 Ford Mustang Q&A

2001 Ford Mustang Question: Engine speeds up and down.

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? -
Answer 1
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. Roy -
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Changed fuel filter, air filter. No luck. Changed plugs and wires. Big improvements at low speed. Still won't get up and go. Could it be a coil or catalytic convertor ? Check engine light is on.