Hi, I have a 1994 S350 turbo diesel and lately when I start the engine hot or cold it runs rough and smokes then I turn it off and restart it and the roughness go away and no more smoke, some times it starts to smoke when I stay idle for a long time, Some one suggested I have a bad "cold start valve" is their such thing on this engine?

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1994 ~ S420


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1998 Monaco Dynasty 40'
1994 S420, 1999 Ford ClubWagen