I have a 2000 S10 Blazer that keeps blowing the ECM1 fuse. We have replaced the coil since we discovered the secondary windings were bad after testing. The module tested good 5X in a row. (Guy said it needed to get hot like it would when running to be sure.) Truck ran for a day and a half, then fuse blew again. We have chased down every wire we can find and have found no bare wires grounding out. Any other ideas would be greatly appreciated. Thanks.