Does anyone know why a control module might fail? I had one go on me last weekend while replacing plugs, wires, cap, and rotor. Then grabbed a used one, tested spark, all was good but very briefly before that module seemed not to work. Replaced it with a new one and everything was fine until today. I brought the truck in for a rad flush and they couldn't get it started afterwards. Unfortunately the mechanics were already gone and they wouldn't allow me to use the tools in the shop so there it sits. I don't know for sure that it is the control module but it seems to have no spark again.