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I wouldn't worry about rough idle @ cold start on N52's. My 330i had this but I haven't noticed it lately.
It would do a "brm brm brm brm brm brm and (then a normal) brrrrrrrrrrrrrrrrrrrrrrrrrrr
I started using shell 93 octane fuel and maybe that helped get rid of it.
BTW I'm at 77k mi.
Funk74, yours seems to be the HPFP.
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