My truck is a 2013 F-350 6.7l powerstroke that has around 137000 miles on it and has been deleted. Oil changes every 3k miles and haven’t really had any big problems until today. On my way to work this morning the truck started shaking violently at around 1500 rpm and it would stop if I got below that. It stopped right before I got to worm but started right after I left work again. I saw something about the 15 and 16 models having problems with the valves. I’m just looking for any ideas.