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Just throwing this out there - if you have a an aftermarket stereo like I have a 600Watt amp with 1.2 Farad capacitor and at idle it'll jump up and down to charge with the alternator even with the cap.
But if you don't then...
My s13 ka24de has a valve cover leak at the top where the hose is connected (somehow the stock metal tube came loose) so that's been causing a very minute vacuum leak creating an erratic idle. So i'd check to see if the valve cover is leaking or there's a vacuum leak anywhere. Or my second guess if not vacuum leak (possible also from the iacv) is the tps sensor is going bad (just check it with a multimeter to see if it's still in spec). For example. My ka24e's tps sensor polarity somehow reversed on it's own which confused the ecu into an erratic idle. I'd check those two things first since they are the easiest. Last if neither of those fix it then i'd clean out your iacv thoroughly - there's a thread around here somewhere that show's you how to do it - remove, dissamble, thoroughly clean and then reinstall.
Hope that helps you out.
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