Sam Holt

I have a link plus and am trying to use the factory ISC. It is the 3 wire solonoid. I was not using the ISC before and motor ran good but surged at idle and low rpm cruise. I used throttle plates to achieve idle. I hooked up the wires to the factory ISC. Now the throttle plates are full closed and the idle is around 1600 RPM. The ISC is open at cold. It dose not seem to change idle when I adjust duty cycle. Is this soloniod not compatible with link or am i doing something wrong.I checked the wiring and the solonoid opens and closes with 12v. (open,12v,close)ie.3 pin.