I have a small problem with my s2 rst running mfi. When im in low revs ( 2,000 rpm ish) and i want to put my foot down to increase speed and get the revs up the car wont move. I can weld my foot on the floor and it still wont accelerate for a good few seconds then it launches. Its like it is holding back and then the revs pick up and go. Could this be a problem with the metering unit or turbo. It has had few basic mods like filter,fmic,exhaust,-31,chip

cheers geoff

 

help anybody?