Well, you can throw the O2 sensor theory out. The codes you got should be a hint that your MAF is indeed malfunctioning.
The O2 sensor does not affect the car at wide open throttle. The car goes into "open loop" mode and ignores emissions components.
The EGR valve will also not affect you at wide open throttle, it's for idle.
Also, the baro/map sensor code shouldn't concern you. Not at wide open throttle. The MAF sensor would override it anyway.
Make sure your MAF sensor is properly connected. If it is mustang17 more than likely hit the nail on the head.
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