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Based on the threads I've read about ignition problems with the X Bimmers, spark plugs, ignition coils and fuel injectors are commonly linked to ignition issues and usually need to be replaced in E71s around 40000-50000 miles. I replaced the spark plugs last week in mine, and I'm going to replace the fuel injectors and coils next weekend. Is it possible your spark plug is fouled up because the tune has a richer fuel/air mixture and now the spark plug isn't firing properly?
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