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Another thing too is check if the MAF is the OEM sensor or cheap replacement. The cheap ones don't last long, and are terrible for tuning. Those and cam position sensors are the most fallible things, then coil packs. From your codes my guess is the MAF though but you can try other things like grounding mentioned above or just cleaning the connectors on the MAF first of course before you go throwing money at it. If you have a multimeter is worth using it!
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