Wayne, after reading all the comments, (and all are good), the suggestions for checking wiring at certain points are good, but before I finished reading your post, I was thinking, TFI module, or ignition control module that attaches to the distributor. I was driving an 86 F150 4.9, going to lunch one day and it just quit about a mile from work. Had it hauled in and one of the techs checked it and that was the problem. About three years ago I bought another 86 with 5.0 FI. Had it less than two weeks and it quit. After it sat for about half an hour, I could crank it and it would hit once in a while, but not run. Hauled it home and called my favorite tech at the dealership where I used to work. He said, "Sounds like the ignition module." (This was on a weekend). Then he said, "Come by work some day, I think I have a used unit in my tool box that I will give you." So I did, and I am still running it. The one that was on it was made in the "land of almost right" as they say. I am still running it. You say you have a weak spark, but it could still be the module. This tech told me that if he suspects the ignition module,when he tests drives one he carries a can of carburetor or brae cleaner with him and if it quits, he will spray it down with the cleaner. The fast evaporating cleaner will cool the module enough to fire again in most instances. BTW, they cost a bit more, but I highly recommend a Motorcraft unit.
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