Higher Idle Seed

I have an 02 cavalier with a 2.4 that did the same thing. I also went down the road of Iat senor after reading forum about high idle. Approximate temp Vs resistance at 77 deg f 2796 ohm 68 deg f 3520 ohm and at 59 deg f 4450 ohms. My car it was the tps sensor that was giveing it the high idle. It was telling the computer that I was at 2% throtle when I was at idle. You will need to put it on a scan tool that has datastream to see what the sensors read when running. Also depending on the scanner some will give you a read out for the IAT but if it is still under the hood expect the temp to be higher than ambeaint air temp.