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You can always try to reset the powertrain's ECU and let it recalibrate. You can do that by starting your car without turning on the engine. Step on the gas pedal for 15 seconds. Shut down your car then wait 15 - 20 mins before you start the car again. Try not to mess around variables like gasoline brand and quality and always use the highest grade fuel as tiny high compression turbo engines like the one in X1 needs it to run smoothly.
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