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In my case, the 64 Thunderbird 390 in my 65 on cold winter morning the stars had to be aligned to get the engine to start, I swapped points for Electronic Ignition, out of the number of options I went with Durapark ll, now zoom-zoom, starting is no longer an issue.
I don't know that I can say I've never had a problem with Duraspark II anymore, but certainly never in my Mach 1 and I've driven it coast to coast. I have a '76 F150 with a 390 that suddenly started cutting out last fall and now won't even try to start. I haven't had time to troubleshoot as it's pretty low on my priority list, but it's obviously an ignition problem. I've already tried swapping the module, with no luck so it's probably somewhere else. I had been using a single battery in both trucks swapping back and forth until it completely stopped lighting off at all. I'm waiting for the weather to warm up before I buy another battery and continue troubleshooting.
Had an issue and posted thread when an FTE member posted this link: Got as far as the 2nd page of the diagnostic work sheet; Part 2, Test 7, and appears the problem was not with the module, found I was unable to get an ohm's reading at all. Pulled the distributor, noticed the mounting surface and distributor housing had some serious surface rust, cleaned both, wiggled a couple wire, and cleaned the stater, reinstalled the distributor and tested; O' my, got a reading. Reassembled harnesses, set timing, and Zoom-Zoom. The work sheet, wire wheel and sand paper saved me the cost of a replacing the module?