Hey man...I'm new at this deal too having just bought a used 2000 M5. I have similar issues and suspect it is something electrical in may case as the same hessitation/irregularity can be felt/heard in neutral. IF you rev the engine slowly and detect no variability in response, it's likely the clutch...otherwise electrical in nature...just my 2 cents. Mine appears to be "missing" a bit...especially when first driven (prior to warm-up). Nobody else noticed this but me. When I get resolution, I'll post an update. Good luck.