David McCauley (Honolulu, Hawaii) - 1987 Toyota MR2
David’s engine RPM surges when the car is in neutral. This happens most in cool weather, while the engine is still cold and it stops surging once the car warms up. Tom and Ray think the problem is most likely a vacuum leak in the bellows between the air mass meter and throttle body. Or, it could just be a loose clamp. In either case, it’s not a big deal.