ok... when i first start my car it idles at like 2500 rpm and then after it warms up it drops to like 900 rpm and then goes to 2500 rpm and it keeps jumpin back up and down between 900 and 2500... i have a 1990 integra and it still all stock... can somebody please help me on this problem an d tell me what i can do to fix it... thanks alot....