snoranger
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I guess I didn't read the part about it running perfect with the alternator disconnected . Well, at least that narrows it down to an electrical problem. Have you checked the connectors that are on the drivers side inner wheel well. The insulation on the wires there have a tendency to shrink and have been known to cause problems.
Have you tested the voltage output of the alternator as you're attempting to rev it (at least 1800 rpm)? Also, when you check the voltage, check for AC voltage. If you have any AC voltage it's the alternator. I just read that a shorted diode in the alternator will introduce AC voltage. Real bad for your electronics, and not necessarily detectable when testing the alternator at your local auto parts store. It's too bad you don't have an old spare alternator to try a swap.
I ran into a Chevy cavalier about 15-16 years ago that was “leaking” AC voltage from the alternator... it would run 100% perfect with the alternator disconnected, but you hook it back up and all hell broke loose. Every light on the dash lit up, random misfires, wouldn’t accelerate, etc. AC voltage can cause havoc.