Not sure about your 200, but will recommend to touch the idle stabilizer while the car is running, does it vibrate??? If it does not vibrate the idle stabilizer or the idle programmer is bad. Remove the idle stabilizer and plug the openings idle should be stable. Worked for me on the 86 5K cstq. Avi Meron 86 5K cstq without an idle stabilizer, openings are plugged, car runs fine.