Just thought I'd put this puzzle up for you techies. I changed my 88YJ with the 4.2 6I over to a n HEI i bought a year ago. Ran great until recently. Started blowing ignition modules. So far 4. I changed to a different dist body, all the innerds of the dist, and still am blowing modules. Driving down the road at 45-50 mph, GONE! No symptoms-just quits and won't restart. Or it runs fine, I park it and two three days later, go to use it (NOT a DD) and it won't start. Making me crazy-and I don't need any help there. When it runs, runs great.
I and my mechanic buddy are stumped. He wants to go to a high output coil and the old points system. I want to know why it is blowing modules. Don't want to add something new 'til I know what is going on. Answers?