I had some conflicting stories, so we started it first at 0 degrees and it was backfiring and running rough. Pulled the dist, set the crank mark at 10, and it ran better, but the motor got up to temp, backfired and quit. The ignition key wont turn the motor over any more, but I can crank it by crossing the solineoid but it still wont start. It does have fire cause I checked but it still wont start, any help here?