Having problems with my car with regards to spluttering from around 5'000 rpm onwards in 4th and 5th. I believe it is due to the fact that the car is overfueling as I have an uprated fuel pump (walbro 255). However I have been told that it could be a problem with my fuel pressure regulator or even that my induction kit isn't on the right way? Could anyone shed some light on this for me as i'm not sure why it does it. The car is not mapped and is running standard ecu and standard boost which is what leads me to believe that is down to overfueling.
