HELP please! trouble code 00515 (hall sender)

ok heres the deal. I have a 95' jetta. I have an intermittent check engine light on and off. car runs fine when light is off, crappy when its on. the code came back as hall sender signal. So i spend some cash, get a whole new distributor. replaced the plugs, wires, cap, and rotor. Car still does the same thing. Im ready to give up. Can someone please help me with this one.