Pls help, C180 CGI slight vibration
 

Hello everybody.
I am new to this forum and i hope to find an answer to my problem. i have an Mecedes C180 CGI of March 2010. One month ago i brought the car to Mercedes service and they put the new software on my car.
From this period, on the morning when the car motor is not heated enough, i feel a slight vibration just when i start driving and i breake. I can feel this vibration when i breake or even when i take away the leg from the acelerator, and when the car is going very slow and i just pull a little bit the acelerator (a this moment i feel this vibration too)
i have been also to the service, but they can not find the reason of this problem.
pls help me. thank you!