Have you checked your distributor cap? I had a similar issue last year. Had a nice drive and car was running great. Was at a redlight and when I turned it cut out on me. Restarted, but cut back out after 100ft. Had to get it flatbedded home, which wasn't a couple miles thankfully. Turned out the distributor cap was bad, the center carbon button was all but gone. This in turn must have taken out the MSD box. Replaced both & running great since. The coil tested good, but I replaced it anyway.
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