It sounds like some things may have gotten unplugged. The IAT sits in the intake tube, so make sure that's where it is and that it's plugged in. The fact that all three of those sensors are right there together, location-wise, leads me to believe that you may have somehow unplugged all of them. The IAC and MAF both have similar plugs. There is a possibility they could have been switched around somehow. The IAT code may show if you didn't plug in the sensor.