1985 190e NEED help - rough idle :(

Hi,

My 1985 mercedes 190e has this idle problem now and has for some time.

It idles rough on start and it actually stalls unless i give it gas until the engine has warmed up which takes about 2-3 miles to achieve. Then it runs fine(so while its still cold ....when coming to stops or lights.. i have to put it in neutral and give it gas to keep it going or give gas/hold break peddle to keep it going)

now i changed the mass airflow system, put in a new hex key and adjusted the air fuel mixture, the spark plugs, cap and rotor are fine, I changed the overprotection relay and fuse in it.

the cold start valve was changed about 3 years ago.. maybe that is the problem? or the idle control valve? my mechanic and I can't figure out WHY it stalls upon start and idles rough when engine is cold.

any help would be much much appreciated .
Thank you
Adam