Poor start, rough idle
 

I have a 1993 190E 2.6 Had past problems and replaced the fuel distributor that a previous owner had "fixed" Lent the vehicle to a friend--ended up having to replace the mass air meter. Since this replacement with a previously owned unit and the vehicle sitting for 6 months, had start problems. Jumped the cold start injector to fuel engine. Will only run at high rpms. Checked the fuel pressure at the fuel distributor-only at 34lbs. Any help????