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Depending on what you exactly mean for "power itself off" causes may vary.
It's like a brutal electric shut down or like chocking due to fuel lack always at the same RPMS? If it's cause by an electric failure dealer need to check all wires, connections, etc. while if the cause is in the map it's another story. IIRC you just had your new engine 120R installed, right? When at the dealer I'd verify the map they flashed on your ECM is the correct one for the type of engine/mods you've got.
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