95 f250 4x4 running rough
 

I just bought a 95 f250 extended cab 4x4 powerstroke from a guy and it is running very odd. it actually sounds quiet at idle. It only sounds like a normal 7.3 when you step on it.. It studders when your taking off almost like it wants to die but if bring the rpms up it acts better. Its leaking oil from the driver valve cover and there seems to be a wire connector disconnected by the turbo, is that part of the glow plugs?