'02 2.2L Low Idle Speed
 

So this just happened tonight...the car randomly now idles at 400-500 RPM and the inside lights dim and engine sounds like it died when I either put the clutch in or put the tranny in neutral. In fact, the engine completely died at one point. At stops I manually kept it above 1000 during my cruise. Also, I finally parked it, pulled the e-brake and bam, the idle speed shot back up to 1000 RPMs.

For the seven months I've owned the car, it's always idled at 1000 RPMs.
I have a manual/5-speed.
Fuel pump was recently replaced after it decided to go... :/

maybe you aic? air idle control. its on the throttle body, try either pulling it off and cleaning it with seafoam or replace it

The ac kills mine at idle. Depending on weather iv noticed sometimes it would idle a little low exspecially when its hot but I haven't had any trouble this winter. Unfortunatly the idle speed cant be adjusted w/o up tuners. But when I first got the the car it always idled rough, after I put on the intake it helped it a bunch. I also have the auto trans so idk if that would cause any significance in your issue

mine does the same thing but I have only ever had it die after it got ran hard

After having it remainder of Sunday & today - it is no longer running low. However if it does it again I'll look into it ASAP, but plans now are to wait until it is a little warmer outside. :P

i wonder if your throttle position sensor is messed up?