sorry I don't post as much as I should, but i have a problem. I have a 1990 camaro rs w/ a stock 305 throttle body its all stock no changes. ok so when i cold start it my car will idle at somewhere between 1800 and 2100rpm and if i rev the engine to get it to go down it'll stay for a few mins. and eventually go down. and if i shift into drive/reverse before it goes down to normal the whole car will jump and it feels like something could break unless i sit their for five mins. to let it go down. It doesn't have a carburetor so thats out of the question it has a computer so anyone have any ideas?