Just done an S2 motor transplant into an MK5 shell, to start with it was overfueling so i unplugged the cold start valve then plugged it back in and now the plugs stay clean as they should and it doesnt smell like shell refinery when running but it still cuts out unless you hold the revs up and it runs a little bit lumpy unless you hold it above 2000 rpm, any ideas? regards. pete