2010 8.3 cummins problems

[towman1]

i have a 2010 t-370 kw-tow truck- with 59000 miles on it. i am having issues with it-sometimes when i let off accelecator it will get a pop back through the breather-or sometimes when i accelerate it will pop through the breather 2-3 times but it wont show any codes-i have forced re-gen/the truck check the turbo-for sticking. but it is smooth-i thought maybe vgt actuator-but i dont know-i hate to start throwing parts at it. its like its getting to much pressure and its coming back-through the breather- any advice would be helpful-thank you