Im struggling with my first GN here. I installed a new MAF pipe, cone filter, plugs and wires, but otherwise car is completely stock. 53k miles. I checked TPS and have .44 idle and 4.54 WOT. Car starts and drives fine. Under boost it seems to have a rattle and cuts in and out a ton. Any ideas? i have only had the car 3 weeks and it just started doing this. Oh and it appears to have a new fuel filter as i was going to change that hoping that was it.