HI
Make sure to check this part out because this solved my stalling problems.
http://www.***************/search/product.aspx?sid=cmvjdia3fhz55155dm2u4l55&makeid=800016@Mercedes&modelid=1192654@190E&year=1988&cid=screen@screen&gid=6200@Fuel%20Filter
-Fuel filter in tank screen
This requires you to remove your fuel tank but it could be the source of problems.
A dirty or clogged fuel filter in your gas tanks will cause air in the system and hence cause stalling.
I checked all the electronics related to the fuel system and everything thing checked out so i looked there and it was clogged and dirty. I replaced it and the car runs great agian.