omg my merc!
 

today I started my 92 300SD its been about a month since I didnt start her. when I started her she needed good cranking about 3times. and when did start was running real rough car was vibrating. and she calm down after 20 seconds. I was really worried that car was violently shaking like cold puppy. I hope I didnt cause any engine damage.:(

Glow plugs? Air in the fuel lines?

If you didn't have any signs of the same problem before you parked it, then I agree that it sounds like a slow leak in the fuel system may have partially filled you fuel lines with some air. Any other symptoms? What happens when you try to start it now?

by any chance was the car parked with the front above the rear? these cars M pumps LOVE to leak air back to the tank in this position... a sure sign of needing DV seals...

yeah car front was up and rear was down. and I did open and close fuel tank cap 2times during parked period. and I saw small oil leak on ground dont know where. What is DV seals?