I'm having problems with the truck surging on moderate acceleration. It drives normal under lite acceleration. It seems to do it only when it warms up. The IAT temp's are in the 90's with the liquid intercooler. It does have a newly installed rear turbo system. I had a dyno tune done and the tuner said it looked dirty all over. Stock it made 212rwhp then with 6 lbs boost it made 340. But with 9 lbs it made 390. Not much of a difference. Did a pressure test on the piping and it's holding good pressure. It should have made a lot more power with 9 lbs boost. It also has 60 lb injectors. Any ideas?