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Hi Bro, There is some problem with my idling rpm. something stop at traffic light the rpm will drop to 500 rpm and stay there den sometime slowly go up to 850rpm like that. sometime just normal at 850-900rpm. Any bro encounter this before? is there a problem? Thank You,

i have a totally unmodified 2002 Corolla 1.5 Xli(A). Occasionally, and i must stress- unpredictably, idle speed drops to 500 rpm and vibrates the car REALLY violently for 2 or 3 seconds before climbing back up to normal. It does not always happen, and when it does, its always after at least 15s or so of idling at the red lights with tranny in drive mode and aircon on. And the vibration always lasts 2-3 seconds at most, before rpm goes back to normal. 99% of the time, she can idle all day and not exhibit this problem at all. Apart from this unstable idle speed poblem, engine is still as good as brand new. Powerful, rev-happy and redlines all day with ease. Throttle body has been dismantled and throttle valve cleaned thoroughly, twice infact, but to no avail. I use Shell 95 UL all the time. Belts are fine, sparks plugs are new, air filter is new, ATF is new and engine oil is changed religiously. Should i change fuel filter? (Manual says change every 8 years; girl's barely 3 years old)Could this be an idle control valve problem? Its really expensive to change. . . at least 200bucks brand new. . . . Anyone has the same problem? Is Borneo able to resolve it? Help!