I've looked at used TBs on ebay, nothing has popped up yet, But it is something I'm coinciding.

I've had a small exhaust leak for a couple of months. It's the original system except for the rear muffler. It is very sooty around the OXY sensor although I couldn't find a leak. It gets real hot real fast! But I moved the wires and it seams to idle worse. I wonder if the leak near the OX sensor is effecting the exhaust mixture reading and/or some criters got into the wiring?