Sharky, I have fussed with the auto EFI at home. There are some things the ECU takes for granted so maybe back up and check stuff any motor needs. Take a look at plugged line , plugged fuel filter. I once had a similar experience with a car and finally found a partially plugged fuel line which would starve the carb float bowl, recover , then refuse throttle enrich, over and over. I still don't know what the stuff was blocking the line. It looked like a filter from a filter cigarette. Try a substitute pressure regulator, injector, fuel pump if you can avoid having to buy them. Borrow a spare ECU from a shop if you can find one. Good luck.,