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Sounds like the clutch is slipping if it happens while driving. If it does it when you first start the car, it should be something in the throttle body I suppose
If you're "unsure" about the tune, get a tune for it. I wouldn't drive the car until you have this resolved
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Turbo FR-S Build - Build Thread
JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block
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