I just posted in this post about the same thing....
http://www.mustangforums.com/m_685588/tm.htm
"Not much help when it comes to the tech stuff... but i can say that mine used to do the same thing. I would be driving, then it would just stall. I would have to let it sit for a little bit, then start up and would go. I had some (TFI??? module) replaced and it almost quit doing it. But then, it did it one more time last year and hasnt done it since. Not sure what it is, but there seems to be no cure. I think it has something to do w/ heat though. It always did it to me when it was hot out. Its almost like something is getting hot, shutting the car down, cools off a little, then will run. Very strange, and if you fix the problem, let me know....good luck! "
I have no idea either, but people just tell me to replace this, that, and would like to narrow it down before purchasing every part in the engine. Let me know what you come up with....
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95 GT Vert- Mostly Exterior Mods, 3.73's, Transgo Shift Kit, CAI