The mechanic who was being helpful had a conversation with me, late yesterday afternoon. He told me to replace my speed sensor, as it might be shorting out causing the 8v signal from the computer to interfere. He also said that when I came back and picked up my truck it should start up fine, after it cooled down. I picked up my truck, it had a longer than normal crank before start but it cranked. The miss was gone, my fuel mileage is back up, and my power seems to be back. Today the truck cranked up on the first key touch, like normal, every single time.

I'm going to go looking for an inexpensive OBD1 reader so I can pull codes myself, and I'm going to look into having the crank sensor replaced. As of right now the truck is running normally, shifting perfectly, and I know he was able to set the Sync signal so that issue seems to be cleared up. Thank you for your patience with all of this, and your help, Nitrous.