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I'm not sure about the answers to your questions, but have you considered you may have gotten bad gas? I'd try some Dry-Gas in case the gas had some water in it.
Does the CEL go out at WOT? I would think if the O2 sensor was that confused and crippling operation it wouldn't correct itself at WOT, but that could be a whole other set of parameters and I could be way wrong.
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Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd
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