I strongly recommend a new O2.... If the car runs good I'd be very tempted to say that the MAF is fine.... a cleaning wouldn't hurt it tho...
For the Plugs, Ac Delco, Autolite, NGK'* and the like are fine... steer clear of Bosch..
The Older 1 wire O2'* like the 92'* used did not have a long life expectancy.... 60k seemed to be the point where most would drop off... and your mileage numbers seem to match up with a pretty much dead O2 sensor... If you do the proper searches most of the time you can get an AC Delco O2 for $20 to your front door.... I always get 2 or 3 of these at a time being that I have 2 cars that use them and a few friends that have cars that use them as well..
Your 92 should do no worse than 17-18 with you beating on it..
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