I can only add my two experiences like this ,,,,,,,usually when its sudden lights out - like someone literally shuts the engine off suddenly - its been ignition module related ...replace the module with a good ole USA module and I was good to go...... one time however I had a wiring harness issue where the +12 I was supplying the ignition with would start out at 12 volts fine but heat up after 20-30 minutes of driving , build up resistance and slowly drop down to 8-9 vdc and immediately kill the ignition. When it died there was no stumbling , wheezing or fight to keep itself running. It was just like BAM - someone simply shut the key off - sudden death . I watched the +12 line with a volt meter balanced up on the outside of the windshield , drove it , heated things up and and saw it slowly reduce in voltage for myself on the meter. If I turned my bright headlights on I could make the harness heat up quicker and kill it ....I moved that +12 supply wire to a better source and it never ever died on me again for the rest of the time I owned it . My suggestion watch your +12 supply line to your distributor until your magical 15 -20 minute mark and it heats up and dies to rule that voltage line out out of the equation . Good luck .