The check engine light doesn't come on until after I crank it a whole bunch. Dunno if on-off of the ignition switch helps or not, but eventually the light lights up and flickers with the rapidly actuating relay. I hold the pedal down about 1/2, keep cranking, and eventually it starts, sounds like it's firing on 1 cylinder, and during each firing event, the check engine light goes on and off. Eventually it smooths out, the light stays off, and it runs fine, although it idles a little low. Craziest crap I've ever seen. Sounds like an ECM?