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I have a similar problem on my E65 735i. When driving it feels like a manual clutch slip, there's a definite lag when I accelerate (about a second) and the rev counter blips between around 1800-2000rpm. Higher speeds and this problem dissipates. A local BMW master technician claimed it was due to an air hose having split and that certainly helped resolve some of the jumpiness when changed but it is still apparent. My man is still to figure it out and has suggested a possible reset/remap of the ECU.
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