I did go through the TFI harness per Ford TSB, and found no problems. Re-wrapped the foil and harness. I got to thinking yesterday, that the coil that is on there is a cheapo, and about 8 years old. Since this is temperature related, (it is often close to or over 100 here) I got to thinking maybe that is breaking down electrically inside. So, since I have been reduced to throwing parts at it, I am going to grab a coil and some new plugs on the way home tonight from work, and swap them out..

What could possibly go wrong?