Q: idle races up and down for 15 sec then idles fine does that every now and then on 1996 Chevrolet Corsica

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
also you have to push gas pedle a little for it to start it runs fine plenty of power idle racing up and down getting more often
(1) Answer
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they said they cleaned it was dirty weather to beleive or not he put the old one back on and didnt want to throw parts at it told me to bring it back if check light comes on but it wont and never came on supposed to be a good auto shop