I can't find my problem, and I'm going crazy. 1990 V2500, normally run perfect. On the road last month, and it died. get it home, check fuses... ECM 1 blown. replace..turn key to On position... blows again. sometimes blows on crank. Before the blow, I could hear fuel pump relay click but no fuel pump prime. I changed the relay and fuel injector relay anyway. still blows. I have also changed, distrib & cap, rotor, coil. 3 months ago I changed all sensors. I have traced wiring, everything seems OK. Did the process of elimination with sensors, fuel pump, etc. unplug/plug in... still blows. What am I missing? HELP! please Thank you!