[grumppyoldman]

I was having the same problem your having, mine turned out to be the connections on the ballast resistor. I cleaned them and made sure they were tight. The resistor is located under the dash to the left of the steering column. It is a wire wound resistor and mounted to a fuse block. It regulates the voltage to the coil, if it gets hot it will not pass the correct voltage to fire the coil. After it cools off it works fine. I would check the coil wire when this happens to see what if any voltage your getting to the coil, should be about 3 volts. Al