My 93 Tbird (v6 3.8L) was just being driven in OD when all of a sudden it went from 1 to 3 RPM for no reason, Switching it to park had no effect on it. I almost couldn't keep it at a stop at a stop light. My mechanic has had it for roughly 10 days and has just thrown in the towel. They replaced the MAF sensor, and ECU with no change at all. The engine now wont stay on. Any thoughts or suggestions please? I really don't want to lose my TBird!