Great; thanks for the help.

I now have an obvious exhaust leak and it sounds like a hole in the muffler or maybe a gasket between exhaust pipes is leaking. I am guessing that this may be the reason the readings are off and once the exhaust leak is fixed, the other readings may go away. Sound is pretty much up front and somewhere around the front wheels; do not think the leak is anyplace behind the trailing edge of the front tires.

Not sure what it is. Felt for a leak in the mufflers and the crossover pipes but could not feel any air escaping. Really loud; you can hear me coming 50 yards away.