Checked the voltage at the alt and it is still 12.6 volts. I also checked the the white/green wire on the 4 pin connector at the alternator with the car running it is putting out about 12.6 volts (take note this is the wire that runs directly from the ecu and looks like it should only be putting 1 volt or less, it's a signal wire. I checked this wire for a short, now the book isn't real clear on this test. When I do this test with the 4 pin connector still plugged into the alternator it shows a short, when I unplug it and check for a short (just the wire itself being tested now) there is no short in the wire run. The book doesn't actually say to unplug the connector or not. I don't know if it should still be showing a short with the alt being plugged in or not, (granted the alt itself is grounded). I am scratching my head on this one. I would love to test the ecu with my stock p72 ecu, but my p28 is tuned for 550cc injectors and I would imagine that probably wouldn't work with the idle too well, unless someone knows otherwise?