BMW E90 320D Power Loss Issue at High Revs

Hello everyone, I own a 2008 BMW 3 Series (E90 320D) with a Diesel engine and a mileage of 208,812 km. I'm experiencing a strange issue where I lose engine power at 3.5-4 revs in all gears, similar to limp mode, but there are no fault codes when scanned. If I hold the accelerator down, the car eventually comes to a stop, but if I release it for a second, it goes back to normal, although it still can't exceed 3.5-4 revs. Here's what I've tried so far: - Replaced the pump in the tank - Changed the diesel filter - Replaced injectors - Changed the fuel rail and sensors - Replaced the high fuel pressure pump - Changed the air filter - Replaced the air flow sensor - Checked the ECU There might be more that I've done, but I can't recall everything at the moment. Any help or suggestions would be greatly appreciated!

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