Mark, Thanks for your reply. I have 108k miles on the car, pretty close to yours. I am not extremely technical and do not know what a throttle body actuator is. I am pretty familiar with all work done on the car (by mechanic) and am going to follow up with him but do not recall ever hearing of this part. When the problem initially came up, we got weird error codes, but not any more.
I am going to call my mechanic and will follow up with results. BTW, Mark, what wheels are you running? Thanks again.