Z4m stutter / hesitation

Mine does this and a diagnosed fault was found on a laptop to be coolant temperature sensor. Will change shortly and report findings (because the M has no water temp gauge you will never know if the sensor has failed).
 
I guess this is what you are looking for, lots of reading;
http://www.z4-forum.com/forum/viewtopic.php?t=39891

Lots of people had good results by cleaning the IACV.
In my case cleaning the IACV made a difference (not totally perfect but much better), still going strong ~10kkm later 8)
Good luck.
 
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