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Having your buddies MAF around will make it easier to test. Sounds to me like fuel pump is going bad on you, hence no codes. Try the other MAF first, if that doesnt work pull the pump out of the tank and check the sock filter, check pump for proper operation in a bucket, check fuel filter and fuel lines, check fuel pump wiring. Something could have been sucked up into the fuel rail and clogging injectors but doubtful since it runs ok at light throttle.
My vote = fuel pump/wiring
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