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MORE than likely the MAF sensor. If you can read freeze-frame data for the CEL illuminating event (fault code), then look and see what the fuel-adaptation number was. Usually you see it maxed out, up around 1.31 or so. You also need to be sure that the O-ring at the end of the MAF sensor is installed correctly and no leakage at the end of the intake pipe.
Gilly
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