hey, so the other day my truck developed a hesitation when cruising at highway speed, like a chugging feeling.. Shut it off, restarted the truck it went away.. All was well..

Now today it came back, built good boost, actually a bit to much I think(pegged my 35lb automated gauge, then some) and this time I watched my boost gauge during this and it jumped down in steps with each chugging feeling.. And when I got into it, and I built boost and lett off it has the sounds of a jake brake (puh puh puh puh) as the boost comes down, and jumps down in steps with each sound..

Wtf is goin on.. Oil press in dash reads good, temps are good.. Isn't blowing clouds of black, idles and starts perfect in the mornings..

Any ideas? Starting to kinda freak me out..