So, I put my turbo on, and I went to test the oil lines and such to see if they were leaking, and my car runs like shit. I believe it is back fireing. It starts to do it while sitting, then under load. When I took it for a drive, it wouldn't rev past 4k. I have new plugs(lt. brown color, nothing out of the ordinary) new wires, cap, rotor MSD blaster coil. The timing is set at 10+ with -1 cam timing. I put a new headgasket in, and it does not consume any coolant or oil. Fuel pressure is 39psi at idle and 44psi at wot. New to finding this kind of problem, so please, any advice on this so I can continue boosting my car!