I have about 142k miles on it and I just notice that the car doesn't idle high during cold starts. The RPM remains under 1k and sometimes stumbles. Until it warms up it remains steady at about 900 RPM. I am getting a P0505 code for the IAC too.

I think I'm gonna try to cleanout the IAC valve and if that don't work I'll replace it.

Anyone else have a similar problem?