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What voltage is the O2 putting out. Does it start at 1V when the engine is cold. Does it go to 1V when you go wide open throttle. Does it ever go 1V? It could just be a bad O2 sensor.
The plugs should be fairly white if the engine is running right. That old school tan colour is more for non-fuel infected engines.
O2 sensor should put out either 1V or 0V. you need to start there. If you go wide open throttle and the car RUNS right, but the O2 sensor says 0Volts, then either the O2 is bad, or the fuel pump is going bad, or the maf is going bad (but the maf is almost never bad) it could be an air leak after the maf also. there are plenty of other things of course (injectors regulator ecu etc...) but those are also very unlikely. You need first to make sure the O2 sensor is actually working.
The only thing the ECU actually uses the narrowband for is cruise situation. When you cruise, it flips from 0V->1V->0V constantly. If it isnt doing that while you drive, then it's bad, or the computer is not kicking into closed loop for some other reason. Another way of saying this is, when you go wide open throttle, the O2 sensor is just a monitor for YOUR eyes, not the computer. When you go WOT it should just sit at 1V. If it does not, then it is either bad, or the engine is not getting enough fuel because (fuel pump / maf / etc)
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