Slant 6 dies when driving

Here's a novel idea. Why not try some diagnosis?

well that really was my question. I have a set of 73 manuals and noted that I would diagnose a pickup coil issue with a Chrysler Electronic ignition Tester. I noted a few non - Mopar branded testers that check integrity of the ignition system and specifically the pickup coil on eBay. I asked if I should buy one.
Dennis