Very Very Wierd???

[Joe50]

I'm having an intermittent electrical problem with my ignition. The car is a 93 GT with the 93 Cobra computer. This evening while coming home from work the car died and would not restart. It just cranks over and over. I got out my test light and confirmed that there was power going to the coil, but I was getting no spark out of the coil. This has been happening off and on for about 3 weeks now. I have the MSD distributor and I have changed the module, coil, tried removing the MSD box and putting it back on the stock ignition, changed the coil wire, and the car continues to intermittently die. This afternoon I had a friend bring me home to grab more tools and when I got back to the car on the side of the road it fired right up. I have a feeling this problem may be temperature related. I just don't know where to go from here. It runs right now but there is no telling when it may strand me again. Does anyone have any suggestions for me to at least point me in the right direction. Please help, Im so frustated with this thing.
Thanks