Any suggestions as my local mercedes guy can not find the problem

There are lots of things, but it would be nice to know what was checked and/or replaced up to this point.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

had similar problem with my 300 cold weather very difficult to start
I started adding one gallon of kerosene to every tank of fuel not very convenient, but it started great after that.
I know this isn't really a fix but if you don't have time to mess with it, at least it will get you out of the driveway and to work or wherever.

You put kerosene into a gas engine

You can dial the fuel pressure up a bit and see if that helps.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

Not sure, but probably cannot modify the base fuel pressure on that model, pressure regulator is a selaed unit?

have you tried pouring a bit of gasoline directly down the throttle body, then cranking it? If it starts and runs then, it's probably the cold-start injector. Should be easy for a mechanic to check that function. The cold-start injector is a 7th injector, and only operates below 60 degrees F for a few seconds.

DG

Nothing has been changed as this date
Tom