It still seems like there is a wiring or ground issue. Try cleaning battery posts/terminals then put jumper cables from battery negative terminal and the engine block. Also test your PCM powers and grounds (with everything connected) with volt meter back probing PCM connecter and the other lead at the battery.
I have seen flooding from ruptured fuel pressure regulator diaphragm. They can leak fuel through the vacuum line intermittently.
What ignition system are you running? It is possible you are getting multiple injector pulses per cylinder because of a cracked pole piece in distributor. In another forum there are reports of multiple failed distributors causing similar issues. Parts quality has really suffered lately.
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