I'm having a similar problem which I haven't been able to diagnose. (14 FR-S) My OBD reading tells me that I'm only getting 80.1% absolute throttle. AFR when I give it WOT is 11.4. I have an ESC on my car but I don't think that's related. I cleaned the throttle body intake and the butterfly is positioned full open, but the car just doesn't feel as strong as it should. Not sure what to do next
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