loss of power while driving

I do have a set of new gauges so the old ameter is out of the circuit replaced with a voltage gauge. A previous owner had done all kinds of weird **** to bypass the ignition and put in a pushbutton start but that has all been replaced. The wiring harness in the column is new too. The only part of the electrical system that is not new is the interior harness. I do have a classic auto air AC system now too but that wasn't on when the car shut off.