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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
Maybe the fuel filter has gotten clogged with gunk. I changed mine at about 45,000 miles and it was surprisingly dirty. More time would have eventually clogged it.
Other than that, are your spark plugs good? Perhaps a check or replacement could help.