Jerking hard after 4k rpm

[twinkiemobile]

I recently had my CEL come on due to my ISC and i think due to my O2 sensor. I drove it that way for a long time and the car had not problems. Two days ago, i was driving and reved it up to 4k rpm and the car would build boost but would not go past 4.5k rpm and it would just sputter and jerk really hard. I could hear the sound of air building but not making it through.

I have visually checked all my couplers and my whole i/c. there are not cracks, tears, holes of any kind. I was wondering if there could be other causes of my problem. maybe the ECU dumping more fuel into the car? I will be running a log tomorrow with my dsmlink and after that i will be taking the car apart to instally my FP Green setup and maybe i'll find something. thanks for any advise you guys can give.

- Jose

 

[Froyd79]

Is it the exact same rpm every time? And does it feel like some type of limiter related almost to ecu or electrical or is it more of a mechanical almost a fuel cut?