The IACV comes to mind as one likely suspect. But I think I remember reading here that the IAC and TPS can't be swapped out on a 2009, so the entire TB needs to be replaced. I just went to one of the parts sites, and sure enough, they didn't have those 2 valves listed for a 2009. They are available for my 2005, are reasonably easy to change, and not off the charts in price. I don't know if replacement of the entire TB is definitely the only option for a 2009 but, if it is, thanks a bunch guys for figuring out a way to gouge another $100 or more out of the car buying public.