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O2 sensor does not function at wot. So "loss of power" is not a typical symptom of a bad O2 sensor. When the sensor goes bad, then your closed loop operation is compromised, the engine will start "learning" the wrong fuel % values for each fuel map cell and the result is either too rich, or too lean, when driving during closed loop. yours sounds like "too lean", which would cause a consistent lean misfire, during idle/part throttle driving.
it would not cause, for instance, a misfire during wide open throttle.
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