a few weeks ago my car started idling at around 2-300 rpm. it did this for about a week and i finally got around to blocking off the EGR and cleaning the TB. this seemed to fix it somewhay but now i notice if i pump the brakes the rpm will fall really low almost stalling the car??? i haven't tested the ISC yet but it just doesn't seem like that would have anything to do with it. other than the brake pumping thing the idle seems fine. any clue as to what could cause this?

1997 Mitsubishi Eclipse GSX: K&N Filter, John Sheppard built transmission with GVR4 1st gear, autometer boost gauge, "free mods", Greddy type-s BOV, broken shifter