I have a 2007 650j Has a mis or stuter I recorded it I started it at idel and increased to full and back to idel I run perfectly when cold after it warms up it still runs good but as soon as go to change the eingen speed it starts acting up And it seems to be a lot better in reverse It does not seem to miss at idel Serial No.: T0650JX13XXXX
It looks like the sound file will not upload Sorry
Did you put the recording on a YouTube video? Did you rule out fuel supply issues, fuel tank vent, fuel pressure good, etc? Sorry, need the complete serial number if you would, please. Regular injection pump, or does it have the DE10 electronic pump?