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Q: My 1990 cadillac sedan deville Idles high. on 1990 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
If I press on the brake hard it will idle down. When I am driving if I let off the gass it will maintain speed, without the cruise control on. I just had a tune up done and it has been doing sinse then. What could thye problem be?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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