Hi Men. At wits end. New coils,Plugs,MAF,MAP,Crank sensor,Pressure regulator, Injectors,Throttle position control. The problem is the number 2 injector cuts out intermittently. When I start the car it fires fine. When put in gear the injector electrical stops firing, Tested injector is fine. I lose electrical voltage to #2 injector. Stop start car it comes back and problem is reapeted. Recently got a new key from Mercedes ignition switch is a little rouge getting key out. At wits end. Could it be ignition switch or wiring harness. It just keeps losing power to that injector! Any sugestions would be greatly appreciated. its a Kompressor. Thanks!