Apologies for another post but the problem seems to be worsening. There is still alot of smoke coming from my exhaust when I rev over 2750 rpm. I have discover that it is usually preceeded by the engine running a bit rough and not idling properly. The ride is juddery to start but then runs more smoothly but chucks out loads of smoke above approx 2750 rpm. It only happens (but in abundance) at this point. Please please can someone help? It has been suggested that it maybe the Turbo, what does anybody think about that? And how much would replacement cost?