1985 190e 2.3 8v runs rough

please help. I have power to and from my ovp relay.what pin on the ecm(fuel injection computer) should have power from the relay.I have power on only one pin but they are not numbered so I don't no if its the correct one. also the car runs the same with the ecm plugged in or NOT! hard start poor running when cold then not to bad when hot. Is my computer bad? I have tried unplugging all the sensors to one at a time and nothing helps. please if anyone can help let me know. Those ecm's are not cheap and any help would be appreciated.

thanks,
Sean