I got two codes; P0390 and P0394 initially. I just went to pull the codes after reading your post and it pulled a third code P0000. Can't find anything on the last code. The service manager at the dealership told me that they have been swapping out cam sensors but was very vague on his reasoning. I still have the original sensors but requires me to pull the timing cover so I am doing research before I have to do the job twice. The shifting started after I put about 150 miles on the new engine. It would down shift for no reason in the middle of accelerating. It was the hardest down shift I have felt in any vehicle ever. Nothing was done to the transmission so I am lost on why it would do it. Thanks for your help
Don't know if this helps, but I had the same problem on my Excursion...had a 7.3 in it...then truck shifted like shit and just went into limp mode and had it towed in...it was a cam sensor, which was under what the dealer said Ford had a "voluntary Recall" on...
Here is the rub...about 7k miles later my transmission took a shit...don't know if they were related, but that was not a cheap replacement... Only had 80k on a diesel and did not tow...only thing I had was 38" tires.
All I can say is good luck and stay on them...
Fred