(94 z28, a4, 100,000 miles, a few bolt ons)

wen im sitting at a redlight with the car in drive, it idles low at 500rpms and has a little surge. never goes below 500rpms, but moves a little between 600-500. any ideas?

 

doesn't sound bad did this just start? i know mine idled low before the cam install 5-600 was normal