I think metal shaper got it. Since the carb checks out, and every thing in the fuel line does too, and just about everything else was checked and nothing had failed. That only leaves the coil and the rest of the electrical ignition system(as far as I know, there could be more serious problems???? I'm a novice mechanic) so it could range from a loose wire or one being shorted out on the firewall from cut insulation to the coil getting hot and shorting out. I am not sure how keeping the pedal to the floor would keep the engine running, but everything else checks out, right?
