I have a F250LD with a manual and 4.6l. The truck runs good for the most part but I have a weird issue that seems to be becoming more frequent.

It has a weird hesitation that will come and go under all throttle load except cruising. I thought it might be spark plugs and or coils. I was told the plugs were changed about 20k ago, unknown what kind. Although I will say the previous owner was meticulous and I haven't found a non Motorcraft part yet. I have also tested the coil bricks with a multimeter and they check out.

This has also started just in the last 2 weeks
It will also idle up and stays high like a vacuum leak, but it does not do it all the time so I cannot think its vacuum. I did replace the TPS that died on me over the winter, I did not use a Motorcraft part. Sometime I can pop the throttle and it will come down and other times it will hold to what sounds like 2kish (do not have a tac). When acting up it will also drive itself like the cruise control is on when you take your foot off the gas. Its a manual so it should start decelerating immediately.

I have not torn into it much cause its winter and I have no garage, but the weather is getting nicer so I want to start lining up things to check on the next nice day.

My gut is telling me there is a sensor that is giving me trouble, but not enough to trigger a check engine light.

Need some guidance!