Ever since I did the HCI swap I've had this issue. Ac on, car will stall coming to a stop, and even in first or 2nd gear slowing down. Car has a dyno tune on it, I was able to use the AC on the way home but that was about it.. IAC is working, tested that. Unplugged it, car stalled, so it works. I bumped up the idle a little bit, it idles, but as soon as you rev it, idle drops all the way down and she stalls. Turn it back on, AC off, and it struggles to idle, rpms go up and down, and unless you gas it, it stalls. Ac compressor works fine. I'm ready to torch it. Somebody help.