The capacitor would probably only work if he wasn't going to run a system, if he is I hear the BATCAP's are the best bet. Capacitor might help a little but doubtful, if your rpms jump up and down that drastically then it's gotta be something run by your belt, maybe the pulley on the alternator is going bad, or just the alternator, but go get dem mugs tested at Pep boy or something. But are you sure you're just not screwing around and turning your wheel while you're stopped cause I can damn near get mine to drop to 500 rpms when I do that at a light. Keep it pimpin.
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