Something definitely sounds wrong.
On the Z4M sport mode is VERY different from normal mode.
Did you check for any error codes?
It could also be a bad gas pedal unit sending a bad signal.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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