[Flying Hamster]

Never got a lean/rich or misfire code. The truck started stumbling hard and I pulled over and checked, pulled the wires away from the manifold, separated them and drove home.
Swapped wires and the next couple days it would have trouble going much over 2500 rpm. Then, it backfired a couple times and now runs fine except the Idiot Light and an obnoxious rattle at idle from the cats. You can bang on the cats and duplicate the rattle, so I figure the cats melted down.