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when cold car starts and idles rough for a few seconds and dies. on 2004 Mercedes-Benz C230

on restart it runs fine

poss cold start valve or water in cyl's
That would be nice if it had a cold start valve!
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1 more answer , 2 more comments
may be a bad cold start valve.
That would be nice if it had a cold start valve!
There is your problem, your cold start valve is missing!