Remember to also clean out the idle screw drilling to the right of the throttle body, as this gets clogged up with oil mist and when this gets blocked you won't idle, just stall out. Most noticable when the weather is damp and the engine cold, as the oily gunge gets moist.
Clean this out and a lot of the problems can be resolved, without cleaning the ISV.
I normally have to do this 2x a year with normal driving milage.
John.