My truck was hibernating for the winter till i decided to take it out for a drive on some dry roads today. When i left the driveway and rolled into the throttle i new right away something wasn't right. The boost would climb to well over 20 psi and the truck was moving like a slug. The turbo almost sounded like it gonna go through the hood because of the high pitched noise it was makeing. The turbo whistle just didn't sound right, it alot more high pitched. I went to let off of the throttle and it made that famous turbo fart. I noticed traveling on flat roads doing about 35mph, cause that's all the faster it would go, at about 1500 rpm's the boost was about 15psi. Which normally on flat roads at 35mph the boost usually reads around 5psi or a tad less. After a while of driving it started to make the farting noise quite frequently while i was still on the throttle instead of doing when i let off of it. Anyone have any thoughts on whats causing my truck to boost this high and cause the farting sound and turn the truck into a slug?:shrug: I was gonna pull the turbo off of my spare engine and get it ready just incase i hafta swap 'em. At first i thought sticky vanes, but then i thought it could also be the VGT solenoid. Hopefully it's just the VGT solenoid, but any help from you 6L turbo experts will be greatly appreciated, thanks!