Mike, I'm glad that some one had the answer about the scanner, because I didn't. That's weird. I thought all scanners read live data? Otherwise what's the use of the tool?
Look, I don't want to be a wise guy on this but the plug gap should be set back to OE specs for the testing. The techron will help keep the injector tips clean, I use it once every two months in my car.
Also, take out the PCV's and shake them. If they don't make a clear metallic clicking noise, change them out. Also, make sure the PCV rubber connections are air tight. Also, check the MAP hose for oil build up, that needs to be clean.
You are correct on the O2 sensors, at 20 yrs old they proly are a bit tired. I changed mine out for the same reason.
Tom