Possible head/valve problem

[Rawze]

(10-14-2019 )Downthehaul Wrote:  Interesting I wonder what might cause it. They also said the truck was turned up to 475hp, which made me suspicious. I asked them if that means someone changed the ecm settings in a major way and he said only the horse power was changed, that it wouldn’t cause a noticeable change in mpg. Might that account for the boost pressure?

Dearlersh$its are complete morons who have no clue about that programming in these things.

If it has the wrong program in it then it certainly can cause those types of issues. Here is some reading about that...
http://rawze.com/forums/showthread.php?tid=1&pid=1#pid1

find out what program it actually has in it according to Insite and post the engine ser# here to see if it is compatible.