1999 Ford Mustang Q&A

1999 Ford Mustang Question: idle on car races from 700rpm to over 1000.

when car is started engine races and then cuts down to about 700 rpm. when driving and then stopping at destination car races so much (over1000rpm) when putting car in reverse it kicks in hard. is there an idle sensor on this vehicle or is there something wrong with a choke. -
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