I have a j reg 4x4 saph cossie running stage 3 i only got it yesterday and think i have been stitched up! when you start it from cold it missfires and gives loads of black/blue smoke once you hold the revs above 2500-3000 for a couple of secs this cleares then once it is up to temp it smokes under heavy acceleration i have been told i was sitting and not used often before i got it so i should clean the intercooler and breather system out and it will be ok but im not to sure thats true? thank you for helping!