I had a problem in the very beginning with my MSD set up too, my stang woud run then just shut down as if the battery was yanked- no spark, yet it would turn over. I would let it sit for anywhere from a few minutes to 30 minutes and it would start right back up, only to die a short time later. It turned out to be a defect in the distributor itself, after I started replacing all the stock stuff back through trial and error, have you had it tested? If not get it checked, I had to send mineoff to MSD to get it confirmed that it was bad before they would replace it under warranty!
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