Yeah, I couldn't see any sparking or arcing with the lights off, go figure...

I ended up getting a code 6 after the testing, and the truck would not run at all, just coughed and sputtered. So I replaced the coil/igniter combo with one from the local J-yard, and it ran again. It still cuts out and sputters, nothing like it was earlier though.

Anyways, I got fed up with it and took it to a local shop. So we'll see what they find.