I have a 302 PCM, 1980’s style set up but with a Pertronix Ignitor replacing the points. The engine has been running great, but last week I started her up for a ride (fired up first turn of the key as usual). After a couple of minutes of waiting to make sure everything was running normal, I went inside to get some water and my fishing license/wallet. I came back out after a few minutes and the engine had stopped. I could not start it again; it turned over fine, looked like gas was getting into the carb throat when I pumped the throttle. I tried spraying some starting fluid and it still did not start, but it was turning over fine. I pulled a plug wire and it did not seem like it there was any spark. All the wires in the ignition system (in a very cursory check) seemed to be connected and in order. I pulled the distributor cap and cranked her and the rotor seemed turning normally. I ordered a new pertronix and coil, but replacing them has made no difference. I checked voltage at the coil with the key on; it was 4.5 at the positive side and 1.2 at the negative side. Back at the ballast resistor, it was 4.5 on the side running to the coil, and 11.2 at the input side. Those voltages seem low to me, could that cause no/low spark enough so that the engine would not even sputter at all? If so, I guess have a bad wire/connection somewhere, where is the most likely place to look? I also threw some more new parts at it, including plug/distributor wires, ballast resistor, distributor cap and rotor, and ignition switch. With a test light to the negative side of the coil, I am getting no flashes when the engine is cranking, removing the tach wire, I still get no flashes. I've checked/cleaned/tightened all the grounds and other electrical connections back on the engine. I'm about at my wit's end with this problem. It seems to me there is a loose wire, but I can't seem to locate a culprit anywhere; I am looking for any and all suggestions.