I have no boost leaks and no vacuum leaks. The only faults I'm getting is p1507 and p0171. Fuel pressure was checked by mechanic he believes it had great fuel pressure. What's happening is the car will boost fine any gear then it will just go to no boost randomly. I will accelerate and it will make no attempt on boosting then if I take my foot off the gas pedal and place it back on it will hit boost again. Then the process again will start all over again. The car is tuned to a max boost of 18psi but seems to hit 21 psi on the street sometimes. Does anyone think it might be going into limp mode because of it. The car has all the goodies , I.e wastegate mod and act., 1000hp cooler, plenum, gtx front impeller, exhaust, and so on. Nothing out of the ordinary anyway.