i have an 89 accord 2.0 auto f.i. that has been giving me trouble. idle jumps between 1000 and 2000 rpm when in park or neutral but goes away if put in drive or reverse. last night while driving home the check engine light came on and it got a lot worse. it seemed like it was missing even when in gear, and in park or neutral it raced between 1 and 2k rpm's. dont know much about these cars and would appreciate any help. after shutting off the car and restarting the check engine light went out and it runs better but still revs up and down. any ideas?