So a really really important tip. If you install a new IAC valve you have to gently walk the arm out to about the same position as the old one. Otherwise as mind did at first start it will not work and your engine will race up to 4000+ RPM. I damn near **** myself in the drivers seat when this happened. I then looked at the 8 CEL codes, 4 of which were the IAC valve. Took a breath and installed the old sensor, deep breath again, installed it and phew idled at 1500. I'm not kidding I damn near threw up!