Exhaust pressure

[BlackiceT800]

So here is the full story. Bought this truck with about 270k KM on it, whatever that is in miles. Had no power, but then I wondered if it was because its only a 500hp 1650 torque, so I kept trucking with trying to figure out how it was doing for fuel economy I was get 25psi for boost pressure. Then I noticed I was adding coolant and then more coolant, with no signs of external leak. I have warranty so I took it to kenworth and tell them to check my EGR cooler because I'm pretty sure it's leaking, they put the camera in and what they saw was ugly (pics attached) they replaced the cooler, said they clean the pipe and I've seen where the replace exhaust pressure sensor and the tube. They fired it up set it to do a force regen and said I can come pick it up, when I got there they said I have a another problem during the regen my turbo was making some wierd noise, (chuffing) I think the guy said. The next day they checked the turbo and said the sector shaft was hanging up so they replace it with a reman, I picked up the and I bought a imap sensor and the two temp sensor. Replace those and my truck is stilling like shi#t, hooked up to insite and drove it under load and the accelerator lever position and percent load doesn't go pass 78% but if I use the cruse it loads to 100% but I can't get it to load when I'm driving with the pedal.
Don't mind the typo I'm using my phone to post this