I would clean your MAF first, a can of MAF cleaner and throttle body cleaner is $10.

I originally thought my crankshaft or camshaft sensor was going back but then I finally got a MAF code so I cleaned everything and it works great now.

It helps to have an OBDII adapter and Torque if you have an android phone, iPhone has their own app as well. $30 for the best code reader I've ever used.
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