Well I've figured out a couple of things.
One.
If you have trouble with injectors firing when key is on, it could be a rev limiter verification feature causing it. Found this in the MSD Digital 6AL paperwork. When activated, it will send a signal to your tach to verify your rev limit setting which in turn makes the ECU think engine is cranking.
Two.
After having issues with engine starting then just dying, I found the issue. It was a small problem before I used ECU to control timing and was getting better. After setting it all up to control timing, it got progressively worse. The problem is the small space between the run and start position of ignition switch. There is no power for just less then a second. Just that short pause between start back to run, it made the ECU think you shut off ignition. I can put it in run position and jump the start relay and starts right up and stays running. I can't belive how many degrees of ignition switch movement where there is no 12 volt power at all.
Not sure if my switch is wore out, bad or just a cheap piece. If your having issues with it starting then shutting off, put a test light on your keyed source for EFI unit and just slowly switch between run to start and see if you are having a momentary loss of power. For now, just going to get a start button.