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The guy at Auto Zone said it's easy to fix, but I'm not too much of a car guy. I've got a Haynes Manual, but the Code ID doesn't say what to replace (just to see if the Auto Zone guy wasn't just trying to sell me a $130 part [Oxygen sensor, I think]).
Buy a new MAF sensor. That should do it. Either that or you have one or more of the hoses on the air box disconnected from it. The MAF sensor replacement is extremely easy, just 2 phillips screws and a plug.