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The afc is going to throw everything off on our cars. It's a hot wire maf so it's very dependent on having the correct voltage and resistance down the line to the ECU to feed back the right fuel input to the motor.
I would also check for vacuum leaks. This will cause a lean condition in lower throttle conditions but not so much under load as the FPR loads up and sprays more pressure behind the injectors under load.
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