went for a ride yesterday about 20 miles, 1/2 hr or so and on my way home the engine quit ,no spark but after 20 min. or so it started .i guess my question is if it would have anything to do with the ballast resistor on the firewall.its new but i don`t know what make or model it came from only that it was new,it is different from the original one. other than that i don`t know what to look for.