First, tks for all of your input.
Now some feed back on where we are.
1) The spark plugs have about 6K miles on them and they were installed by SNVA Toyota so I assume they are nippondenso (spelling?).
2) The spark plugs wires, rotor and rotor cap are all original if my memory is correct.
The wires look like new.
The rotor cap seems good although showing some "arc-erorsion on the inside terminals. If someone knows a good measure for good/deteriorated I would appreciate hearing what it is.
The rotor shows no visible arc-erosion and looks ok. I am not sure how one would remove it. It is firmly attached and my manual shows no removal clues.
3) I ohm-tested my air flow meter (AFM) and the
E2-Vs test failed giving a reading of infinity. All other tests were ok.
4) I performed a diagnostic test on my ECU and received diagnostic codes of 2, 5. 8, and 10.
One of the no. 2 code option explainations (Vs-E2 short circuited) matches the AFM error above seeming to confirm a AFM defect. Although I must admit the ohm reading of infinity and the words "Vs-E2 short circuited" apear contradictory.
The diagnostic code no. 5 is for my Ox sensor signal. I am due for a new sensor and will revist this after deleting the codes and taking a relook.
The diagnostic code no. 8 is for "open or short circuit in intake air thermo sensor signal". I assume this sensor is something inside of the AFM. Here they use the "open or short circuited" language which seems contradictory to me but does match the Vs-E2 infinity reading and the no. 2 diagnostic code language of "short circuited."
The diagnostic code no. 10 is for a started signal which I will explore later.
PATH FORWARD: Unless I hear something brilliant from a reader I expect I will have to eat the cost of a new air flow meter.