W123,

Changing all the plugs definately fixed my cold start problems. If you haven't, be sure to do a search on how-to re: changing plugs. You just about have to take off the metal fuel lines to get at the little devils and be prepared for some tedious extraction. Use 10W40 to smooth the way.

There is a special tool that helps with removal of the fuel line (if you have a real good friend that owns a mercedes shop).

This project can be done by most anyone as I succeeded.

Nic
'85 300CD