My jd has been running bad for quite some time, ive gotten it better, then worse, better again, and now terrible. today it started to backfire out the carb. before that it was running like it was bogged, and was very unresponsive. i cleaned the entire fuel system, pulled and cleaned the tank, and that made things worse. it is backfiring and not running smooth at all. i have replaced: Plugs, Points, Condenser, spark plug wires, and the condenser is my main question. half of my original one died, so i put in two singles, a idea i have seen before on the forums. is there a relay of some sort that you have to have the double coil? I have the two singles wire together, and it does run, but backfires. is the coil my problem? and if it is can i get it for less the the 200 bucks that my local jd shop wants? if a video of it running would help, i will make one. Please help me this is my baby, plows my snow, mows the grass, and works like hell.