The ALDA is unmolested with the original black cap on top.

I will check to see if the egr is stuck. The intake runners only have 90K miles on them with very little sludge inside.

What is the part number on those transducers?

If there are error codes, could that result in car running in safe mode (shutting down the transducers) resulting in this rich condition?

I'm hoping my compression values are good and this is nothing more than a computer issue!