Well I just got back from a 2 hr trip and about 3/4 of the way there I had to stop for road work and noticed my Idle was flucuating from 900-1500 rpm's. I looked under the hood to see if there was a vacum line or something came off but I counldn't see anything wrong.

I got home and about 4 hrs later took a trip in to town and it was still doing it, but when I got home I shut my moon roof and I kept it pushed so the roof motar started bogging, I noticed my idle stopped flucuating when I did that. So i turned on my rear defrost on and I noticed it slowed down the rate at which it flucuated??? What the hell is going on? Light's didnt's seem to affect it at all.

This is a 95 Civic EX with about 180k miles.

 

I have the same car, I have replaced fuel pump, fuel filter, distrubter cap+button, IAC valve, and the O2 Sensor. I think my catalytic is full of carbon, ill kept you updated..

Matt