hi guys had my rs turbo rolling roaded today, it has been running shit for ages like its on 3 cylinders the guy at the tuning centre said he thought it was valve related so i went home ripped the head off and the exhaust valves were carboned up pretty bad around the seats etc has anyone encountered this b4. im regrinding them tonight complete with box of miller, a bit pissed off as im £100 quid down for the tune and £30 down on fuel for getting there ,cheers matty