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My 533i is idling rough. After the car heats up, the engine revvs from about 800RPM to about 1800RPM, then cuts off. Above 2500RPM, the car revvs just fine, but the car sputters below 2000RPM, even in gear. My friends and I are completely stumped on this one. We have replaced the Throttle Position Sensor, the O2 Sensor, and cleaned the throttle body.
Here is a video to give a better idea of what I am dealing with: