Today I thought I finally had my IACs sorted out. I set the idle stop screw to .46 volts, reset the computer, reset the IAC plunger, and turned the car on. In park the IACS finally settled to 18-22. I put it in neutral to let it learn for a while, and the IACs settled to 15-20. This was fully warmed up. Good enough for me, I thought. I went out to drive the car for 20 minutes, and when I came back, my IACs were screwed up again. Between 0 and 10 in park. I don't get it. I think I'll have to get a custom program.