Not Ranked
Grant,
First thing that concerns me is that you say your mechanic swapped out all the EFI sensors and plugs. Do you mean he actually replaced all of them, or he pulled the connectors, cleaned and reconnected them? If he replaced all of the sensors I would suggest finding another mechanic, as that would indicate he does not know how to troubleshoot a FI system.
Sounds like you have some ground issues. I doubt there is anything wrong with your Accel ECU and a little water won't harm the MSD either. It sounds like your mechanic stumbled across the ground problem when cleaning and/or replacing the EFI sensors and that was enough for the ground to temporarily work well enough for the engine to run again.
Finally, I would have an alternator shop check the output of your new alternator, as it sounds like that could have a problem with the internal regulator. You should be able to take the car to a decent auto parts store and they have a diagnostic scope they can check the output with without you having to remove the alternator.
Mike
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