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John, By that logic, when the car is in open loop mode, it should run fine. Is there a way to keep the car in open loop to test this hypothesis?

I guess my electrical knowledge isn't up to snuff, but I don't understand why these issues would only occur once the car is at or above operating temperature. I would figure if a ground was bad, the issue would always occur, or occur intermittently, not consistently at temperature.

Sorry for the long post... I have a 1993 4spd auto Corvette coupe (only 16k miles) that's been misbehaving since August 2010. Back in August it developed a stalling problem that seemed to occur at high engine temperature. It would stall, sometimes run a bit rough beforehand, but it was like...