When I get the time and someone to help me I am going to have someone drive it while I have a scan tool connected and see exactly what is going on. I have checked it in the driveway and everything is within normal parameters however having the engine under load definitely changes things. Sometime today I plan to pull the plugs and have a read. I have not been out of town with it in a couple of months and the exhaust pipe is now pretty sooty which makes me wonder. If the plug read shows it to be running fat I will screw in a new O2 sensor. What I can see from the top there is a sensor in the RH head pipe and none in the LH one. Seems a bit strange but I can see the whole pipe upstream from the primary cat. When I put it in the garage to check the plugs I will jack it up to have a better look.