Well, I forgot this in my post the first time around, but better late than never...Mass airflow sensor was my first thought. At the shop, they checked it out and noticed that it wasn't responding correctly. They replaced the sensor, and it seemed to be working fine for about a week. Then it was back to its old ways. They got another sensor (under warranty) and put it on...then, as I said, it broke down on my way to pick it up. They're thinking now that it might be the computer...of course, I hope thats not the case! I'll check your suggestions...thanks!