1990 Cadillac DeVille Q&A

1990 Cadillac DeVille Question: My 1990 cadillac sedan deville Idles high.

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? -
Answer 1
possible vacuum leak -