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Poor idle when cold

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I have a 108cdi on an 02 which has done 48K. Trouble is on cold mornings it runs quite rough and smokes a lot like it's rinning too rich, even though it starts fine. Could it be a temp sensor to blame? It seems to run ok when warm.
Secondly, the gearbox seem to be getting quite notchy, I have removed the ashtray and oiled the cables but noticed that they are adjustable, is this a job for the home mechanic or is it better left to Merc. Are limits available for the free play anywhere?