did you ever get this car going? what year and model is it? if you have spark, fuel, compression, it has to run--when it dies, something failed at that moment. IPD is right considering the wiring. If your car is of the 80's vintage with sketchy wiring, it is a prime suspect. If you do not want to fork over the dough for a new harness, or harnesses, consider cutting open the sheathing on the wiring around the crank down near the oil pan. This area takes a beating, gets oil, water and the insulation fails. When you run a little bit, the new heat makes the wires expand and rub and the signal to the coil/distributor gets muddled. One inch clear vinyl tubing makes an excellent new sheath. I went through this a few years ago with an 86 and it ran for another 150k without a peep. Gotta keep digging.