hey there my m8s got a rs turbo e reg that has number engine mods like stage 3 head hybrid stage 2 pistons stonger vavles that sort of things its been rolling roaded at 208 bhp but it has now come across a problem if u turn it over it will start tick over fine but wen u rev it it sputters and runs on and off number 4 spark and wont rev past 3 with loads of black smoke
and clears after about 3 mins but if u turn it off and go stright to it it will do it again have u ne idea wot it is if change the fuel pump cold start and the accumlator cheers