I have a 06 lbz and I run it on level 2 ppe hot 2. When im cruising at 60 in 6th gear and go to lug it sometimes it will only bring rail pressure up to 17 thousand and boost will only go up to 8 psi which makes it really doggy.Other times it will build right up to 20 psi with rail at 23 thousand.Theres no codes just acts up when it wants,what could be causing this? Also if I leave it in 4 at 55 and get on it it will not accelerate very fast but if I stay driving in 4th at 55 for awhile and get on it it'll smoke a little and haul ass all the way in tell you let off it.