I got my truck, 2015 F-250 XLT 6.2L a couple years ago with 44K on it and it ran good. Seemed a little gutless but I attributed that to the weight of the truck. More recently it's idle seemed a little bit off but hardly noticeable. Check engine light came on which surprised me because I big reason I got the truck was for reliability. None the less it is a machine so things happen. Bought a Bluetooth OBD2 scanner and got the code P06B6 (Internal Control Module Knock Sensor). Truck was running OK so I erased the code to see if it would come back. After a few days it did so I decided I'd start looking into it. Well, before I could take any action the trucks performance declined pretty rapidly, to the point I thought it might die going up a hill or at a stoplight. It sort of felt like the transmission was slipping but that didn't add up based on the code. I had done a little research and figured it was plugs/coils/wires or broken valve spring. A little more digging and I ruled out the valve spring based on startup noises compared to some videos on Youtube plus some threads on here seemed more in line with the plugs/coils/wires, especially given the volume of the ticking noise.
Took the truck to the shop and within a few hours they called saying how bad of a condition the plugs/coils/wires were in and that would send pictures if needed. I trust this shop so I decided to go ahead with the repair and I'll look at the old parts when I get it back. Got the truck back later that day and its performance had drastically improved. Seems obvious that it would perform better but I did not expect it to be that much better than when I first got it but it is more noticeable than I expected. I wish I could say I did the repair myself but I'm happy with the work the shop did.
I wanted to post this so if someone else is dealing with this issue, hopefully it helps them narrow down what might fix their truck.