I've got a similar problem with my M104 320ce. But mine wont even start, it wants to but just wont catch. Ive cleaned the throttle, done the injectors and removed and refitted the mainfold because the crancase ventilation hose would not come off. all has gone back as it should and all the systems appear ok (fuel pumps, injector pulse etc) but this peice of crap just wont go. I pulled off the throttle body as I was getting the occaisional rough idle and stall. Whats this avout the throttle actuator buzzing?????