sounds like a faulty ignition switch, or it could be a cross somewhere, you will have to check around with a meter to figure out exactly where and what the problem is. id recommend sorting out the wiring. however if your intent on deleting the isv, the best way to do it with a butterfly valve from a hardware store. pull out the isv, rig the new valve into its place, let the engine warm up, adjust valve until engine is running better. also you will probably need to make adjustments to the idle screw at the throttle body. the car is gonna run like crap until the engine is warmed from now on though.