Brother, I've been facing a small gripe with my GLi for a while (although it maybe a matter of "personal-particularness"), but sometimes when my car is on idle with the A/C on, the rpm drops a little and I can feel it vibrate, the car then gathers itself back in like 3 seconds or so. At other times, I can hear a faint noise coming from the engine bay as if the belt is loose or something. I got the noise issue checked from Toyota, there seemed to be no problem at that moment in time. However, I've not had the idle-rpm-issue addressed so far (and it is occasional). What do I do?