C 12 Running poorly....any ideas?

Good evening. Today my truck started to act up. Boost pressure is not building to what it used to be, and also EGT's are skyrocketing unless I back out of the throttle. Went through the obvious checklist including new fuel filters, cleaned the air filters, re-tightened all the air to air clamps, etc. with the same results. Thinking it might be turbo/wastegate related. Any input would be appreciated!

 

Thanks Allen I can give it a shot. I put new batteries in a couple weeks ago and made darn sure everything was good and tight, but will double check.

 

Well all the hoses check out good, hose clamps tight, battery cables tight, pressure tested the air to air and it checked out perfect. I pulled the intake boot back from the turbo and grabbed ahold of the impeller shaft and can feel a very little bit of movement both side to side as well as forward and back. Turbo time?

 

Turbo did not fix the problem. I'm stumped. PLEASE HELP!

 

Upon doing the overhead, they found 8 broken/cracked valve springs and bad head gasket. She's getting an inframe overhaul....problem solved!

 

Not too worried about spending a few bucks on it as it's been a great truck for me in the 5 yrs i've ran it. It's in a 2003 pete 379exhd daycab. My mechanic if changing it from the MBL back to a 2KS for me as well so we can run the fuel temp wire and whatnot. They quoted me a "Gold" overhaul package for that $18,000 dollar range which included a turbo, injectors, and a waterpump i believe. I think this was with a 4 yr warranty. They will credit me back since I had just put the new turbo on it, which i believe would get me in that $16,500 range.