I got a 97 taurus with the 3.0L V6. Car has been idling high. Its usually just above 1400rpm and below 2000rpm. Why is it doing this?! I pulled a code and it said PO430 (bank 2 catalyst below threshold). Can someone please translate this? Plugs n wires haven't been replaced since last July. A new y-pipe and two catalytic converters were installed about a month ago. I replaced one oxygen sensor since it shot a code. It was in bank 1 upstream. Any help would be greatly appreciated!