Found and tested the O2 sensor. Had a reading of 2.8 to 3 ohms accross the two white wires. Tested the other wire to ground and it showed OL on the old Fluke so I assume it is ok.
I will probably go ahead and replace it with a new O2 sensor this weekend. I have been unable to ascertain whether it has ever been replaced or not. Will be good exercise to replace it - will help me get over the intimidation factor.
What is ya'lls feelings with picking up a Bosch O2 sensor from NAPA (quoted price of $167.00) and installing it versus one from the dealer. I did notice that the one in there now has the three pointed start symbol on the plastic connector.