Mornin'

I have a 99' 7.3 with what I "think" having turbo issues... Here's the story..
Going down the interstate running perfect then engine suddenly shut down. Wouldn't start up till cooled off a tad. Started then made it a 1/4 mile. Hooked to computer and found cam position sensor fault. Changed and ran again, but not rite. It missed at idle (only on start up) and was sluggish going over hills. Hooked back to computer and no codes. Drove for a couple days then started shutting down regularly at idle and up to speed from time to time. Had to power brake while stopped to keep running then seemed to run fine under way. Hooked back to computer cleared all existing codes then pulled a P0470. Exhaust back pressure is 38 at idle.. Truck now acts like it has no boost. Feels like it's building but not releasing. Hope this makes sense..
Any help will be beyond appreciated....
Nick

 

*moved to proper section

Sounds like limp mode?? Maybe the hpop is acting up.