hi my m8 has got an s2 rs turbo that he has had the engine fully rebuilt with stage 2 head and the works the problem is it wont run right u start it up and it stalls and wen u get it to tick over it wont rev and it sputers we changed the airflow meter cause we were told it was nacked and its beter but still the same if u plug the airflow in it revs but wont tick over and if u unplug it it deos the oppisite the car ha had pretty much everything new has any1 got any idea wot it is cheers