My Prelude starts up fine, and runs fine. Just after it warms up and ive driven it for a few min the idle drops below 1 grand and the engine starts trys to stall every time i stop. By try i mean shake and shiver till i give it a little gas and push the rpms up over 1 grand. I just bought the car last night so im not sure what kind of gas it has in it, next time i put gas in i will be using premium. Any ideas of why it could be doing this?