This last Friday I went to the store after work and my talon drove fine. When I left, it barely ran, had a horrible time trying to idle, and could barely build enough power to drive up a hill. When I got home, I found the vac line to my fuel pressure regulator had popped off. I reconnected it and my car has been fine. However, during that time, the CEL came on and my scanner reported no codes the first time. After I got home, I had a P00AC code that stated it was manufacturer specific. I can't find any info on this code anywhere. Found P00AB relating to the IAT sensor, but that's it. Today at work I used our SnapOn scanner and it doesn't evenist that code as being active, stored, pending, or history. Scanned it with my BluePoint scanner again, and it still had the code as active. Any ideas?