Throttle induced oscillation. It was first noticed with the E39 M5.
Your foot moves ever so slightly back and forth that is hardly noticeable, but it gets into a rhythm with the throttle and causes the bucking.
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Ex Stig
'25 M5 Touring (on the list, first slot)
'24 X7 M60i
'22 M5 CS - (sold)
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