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it's bolted to the driver's side of the throttle body. remove it (2 screws) and clean it out with carb cleaner. make sure the flap operates easily. re-install it.
while you're there, remove the intake hose from the throttle and look in it for oil. if you see oil, you probably need a new oil separator; this causes a vacuum leak that can cause your unstable idle.
also check for other vacuum leaks while you're in there. do this with propane or carb cleaner. wave / spray it around and see if the RPM's jump. if they do, you have a vacuum leak in that area. any of these can cause your issue without throwing a check engine light.
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