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You haven't mentioned how many miles are on your car.
How's your gas mileage been? Notice any meaningful reduction from what you'd been getting before this problem began?
Have you considered the oxygen sensors? One or more may be iffy, but not bad enough to flash a CEL at all or may only do so intermittently. When my brother owned my '02 S it flashed a CEL at 64k miles and the mechanic replaced one faulty O2 sensor; all was good. I bought the car at 68k miles and read on this forum that it's best to change all 4 sensors at once, so I replaced the other 3 myself and the idle, while not bad before, was very noticeably smoother, and mileage improved 1-2mpg, as did overall driveability.
Hooking up a code reader of some kind (I picked up a 2nd hand Durametric but haven't had to use it yet) could yield lots of good troubleshooting info. AutoZone will let you borrow a basic one for free.
Based on all the things I've read on this forum I'd also look into cleaning the throttle body. My car's probably due for that now too.
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