I have a d16y8, I'm running hondata on a P28 ecu. I'm having some major idle issues. When I start the car it idles around 2500rpms until it warms up. Then after that it still idles high, around 1200rpms. When I come to a stop sign, or a light, the idle bounces between 1k rpms and 2k rpms. Sometimes it bounces and sometimes it's just high. OK, I've done some research and some say it's the iacv. Well I though it was too, but I changed this out about 6 months ago, so it's pretty new. So I'm pretty sure that's not it. It's obd1 but running an obd2 iacv. It's a M/T y8, so I was told it's already a 2-wire, so I don't need to convert it. I've had this issue for awhile, that's why I got the new iacv. It fixed it for a little bit, but it gradually got worse over time and now it's the worst it's ever been. Another thing I can think of that I don't know if it has anything to do with it, is I have a test pipe so the O2 sensor that went in the cat is just zip tied out of the way. I doubt that has anything to do with it. Please help me out with this, it's really pissing me off. I was also told it could be the tps, but if it was that, wouldn't it happen all the time?