mercedes c230 auto sluggish when cold fine after 3-4 minutes running

Do you have a check engine light and when was last tune-up? Check the fuel pressure and coolant temperature sensor-and also clean out the throttle body-start here

replaced coolant temp sensor, still will not accelerate when cold but is fine aftershort warm up

You sure the transmission is not slipping? Check fluid level and condition-also I advise you to check the fuel pressure with a gauge-