A friend with some experience on these engines stopped in... we bled the fuel line at the fuel regulator, and got it running. At his suggestion we pulled the fuel tank to check the metal stand pipe. He's seen several of these cracked near the top which would cause fuel to leak back. Mine was good. We checked codes and several accelerator pedal related codes showed up, but have not reappeared after clearing codes.
So, now it starts every time, and runs perfectly, like it has since I bought it. Guess I'll just drive it and see whether it repeats the glitch.
Thanks for the input.
Lynn