Thanks for the reply. It's a '94 Honda Civic CX. This only started after it the battery had run down (gf left the lights on) and was jumpstarted. It was outside in rather cold weather at the time as well (20 degrees I believe).

No idle problems while driving. It only fluctuates when it is stopped. I would say it idles from a normal level for the car to a very low level. Does not idle high.