Not too long ago I had something similar to this happen to me. I had an engine that acted like it was lean, and cold starts were a *****. You had to start it numerous times before it would keep running. It really sounded and acted like a "lean" problem, but I had diagnosed that it wasn't. Finally I tried another ignition module, and the engine operated perfectly. I ran this by Bill from CH Ignitions, and he said to try a 6 volt pack on the bad ignition. Sure enough, on 6 volts it worked fine. He said that sometimes a weak ignition will do that.... (The unit was a new RCEXL.)

AV8TOR