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Are you driving with the shifter in D or S? In S (sport mode) the car intentionally delays upshifts and will “rev high” as you coast. If RPM is the only issue and the car isn’t continuing to accelerate after you let off the gas then there isn’t anything wrong with the pedal.
Who is your tuner? Making the throttle go wide open is literally their job, and if they can’t figure out how then you probably need to find someone else. But as a side note- you don’t necessarily need the throttle completely open to make power, especially at lower RPM. My car makes 19-20 psi of boost at 3000 RPM with ease, at only ~50% throttle. My throttle doesn’t stay pegged steady open until above 4000 rpm or so.
Ok so tuner is probably NOT the problem lol. PM me if you want I’d be interested to check out your logs
