First, Welcome to the TDR, WBaum. Glad to have ya! (although I see you've been lurking for a while now heh)
Sounds like your ASD relay in the PDC has gone bad.
Behind the drivers battery, there is a rectangular black plastic box. Take the cover off that, you will see 3 1x1" relays. (you can match them up on the legend on the PDC lid). Mark your original ASD relay, then swap it out with either the starter or fuel system relay. If this fixes the problem, change out that relay, or all 3, depending on cost. I have changed all the relays in the PDC, and kept the old on the truck, for backups. Small cost to prevent a dead truck in the middle of nowhere. .
good luck
-j