AND, you moved the plug wires to different locations on the cap with no change, ruling out the distributor.
Damn. This is a good one.
The only thing left that it could possibly be, IMHO, is the ECM. If you have a chip installed, try removing it and resetting the ECM. If you don't, all I can suggest is finding someone with a good ECM that you could borrow to see if there is any change. I don't see any other possibility, but I don't feel comfortable enough to tell you to go buy another ECM, either.
Take care,
~Chris
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