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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!
 

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Suggestion number 1 would be to find a better mechanic if they can't figure this one out. Probably a bad IAC, or possibly a massive vaccuum leak or a sticking throttle cable or throttle body.
 

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Discussion Starter #3
Thanks they threw in the towel today and are tossing it to a Ford mechanic with his own shop down the street. He said hes checked all those things thank you for the ideas though
 

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I would think the IAC, but may also want to check the balancer. The 3.8's are notorious for opening up the keyway. Although I've never heard of it making them rev. If you pull the bolt and then can move the balancer with your hands its bad.

Does the 93's have a distributor?
 

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could be many things: sticking throttle body/throttle body cable, fuel pressure regulator, IAC valve gasket or valve itself may be stuck open, Vacuum leak....
 

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I had a buick with a high idle last week. It took me 5 days to figure it out. It ended up being the 12v feed from the ignition switch to the fuse block that feed a 12v system reference to the computer. The resistance was to high, so the computer saw a 1v drop. That wire would show 12.8v while the other power wire to the computer from the battery would should true voltage at 13.5-14.0. The computer increase the idle to compensate for the low voltage it say. Replaced wire and computer say the voltage on both leads and idle came down.
 
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