im almost positive its the timing belt, i just took off the valve cover and the belt was able to slide back and forth on the and appeard to be a little loose, also when i cranked it over the belt flexed upward between the 2 cam gears, for the record i drive a 91 integra ls special with 60,000 on the engine and tranny and 200,000 on the actual body the engine is out of a GSR integra