The service center owner called while ago and said it is what sounded like the idler control valve, I think. They will get the part in the morning. He said with parts and labor it will cost around $220. Could be worse. I'm just glad it didn't happen out on the interstate or somewhere else really inconvenient and that I have the money to afford to get it fixed. It's a '99 model and hasn't cost me much money in repairs. This is cheaper than a car payment, so I'll keep it until it starts to cost too much. That's what I do.