Electronic 6.5's don't have that style cruise, there drive by wire and the cruise is done through the ECM. I still think your problems are related to your 5068 pump and the chip you got to work with it.Pull the cover off the cruise stepper motor under the hood on the drivers side firewall. You will need to remove 4 #15 torx screws then the cover just pulls off toward you.
Inspect the condition of the worm hear and the main gear. Rotate the main gear and see if it is capable of pulling the throttle WOT.
Let me know your results and take some pics if you can, specifically of the worm gear and the main gear.
No biggie, the 6.5 aint as low tech as some make it out to be. But it aint a Dmax either. I think all of his problems goes back to the fact that somebodyy has replaced chips and ECM's and IP's in this Sub. He's been working on various electronic fuel problems for a while now.Sorry I didn't look at they year.