I have been having problems with my TII for about a month now, and I put a thread up trying to figure out what was going on. I was told to change my TPS and O2 sensor I have changed my TPS but not the O2 yet. The car would sputter when I revved it and wouldn't spool very fast and felt like it was down on power. Tonight coming back from Wendy's I decided to red line the car (as I have never done this before) I have heard that you should do this once in a while to keep carbon out. The car was doing fine and all of a sudden it started bucking really bad and the boost would jump up the gauge. When I got it home I revved the motor a few times all the way to 8000 rpm. After doing this the car now revs freely and smoothly. Now I can take off from a stop and the car tries to go sideways in first gear. It has never done that before. Once I started accelerating the car boosted fine in 1st and 2nd and when I went into 3rd the car started bucking badly and the boost gauge pegged at about 4000 rpm. It only does this if I am full throttle. Is this fuel cut that I am experiencing? And if so why is it just happening now? I can take and post a video of this if anyone needs to see what I am talking about. Thanks for any and all advice.
Jeremy

 

is it stock?
are you reading the stock boost gauge?
if you have decent exhaust mods, no fcd, and no ported wastegate (assuming it's an s4), you will most likely experience fuel cut.

 

Yes, stock turbo and engine. I have a 2.5" downpipe and no cats with factory mufflers. Ive ported the wastegate but have no FCD.