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Yea thats the trouble ( pun ) with those darn trouble codes , they dont tell you how or what to to fix , Just thats theres a problem in that general circuit. When you replaced the Valve did you look at the ports that line up with the holes in it ? they could possibly be plugged with crap. The IAC , is nothing more then a metered vacuum leak , If I remember rite in the 1 inch of travel of the valve theres 225 possible settings that it can relay to the puther ( you scratching your head ? ), You could have a wiring problem going to the valve, Ive seen the connecter fail, What does your throttle plate look like ?

 

It seems like I remember a service message on that but it was the PCV valve causing it. What is the VIN on your car and I will see if I can find the message.