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Update:
My Pathfinder had been pinging for 10000 miles (since I bought it a year ago). Had engine light on a couple of times, which pointed towards O2 sensor. Never did replace it. So with poor fuel mileage, lack of performance, and a horrible engine ping upon acceleration, I finally had it scanned for codes again and then the fuel injection system serviced at Nissan. The dealer called it a "Moto-Vac" (Decarbs and Flushes everything). The engine is disconnected form the fuel system, and runs for an hour or so on a special cleaner.
I immediately noticed better acceleration, and no more ping. Not sure about mileage yet...
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