After my truck was sitting for over a year I finally broke down and had it towed to a shop for a diagnostic. I figured I had probably overlooked something in the umpteen times I've messed with it and it came down to a really stupid mistake. Lo and behold I was right. I had a broken wire from the crank sensor so I jumpered in new wires to the PCM. I ended up wiring the damn thing backwards. I could not believe I did that especially having a perfect wiring record over an entire Air Force career in aircraft maintenance.
Anyway, truck was running and sounded like crap. Mechanic told me no compression on cylinder #4. Took valve cover off and saw that the exhaust valve was stuck open. Luckily, the piston just has a small point of contact and the valve seat is fine. I'm currently in the process of putting everything back together.
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On a side, yet related, note, is there an easy way to get an EGR valve gasket from between the balancer and the block? Also, there's a post on the rear of the left cylinder head where a couple of grounds are attached but I can't find the nut that was there. Does anyone know the size of that nut?