A week ago, I was driving the car to my new house, cruise control set at 75 and 62 miles into the trip the car backfired and quit running. There is no spark at the plugs/wires. The car tripped a code 51 (bad eprom, ecm). I replaced the ecm to no avail. Could the coil pack have blown? Where do I start? I missed Bowling Green thsi year because of this problem. I have went through 5 ecms in 19 months. Wiring all checks good. What else could it be? T-top car stored in garage, etc.