BMW Questions? Ask a BMW Repair Expert for Answers.
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this would typically indicate a turbo issue on this model. Other causes would be a fuel delivery problem or faulty injectors, but the turbo is most likely based on what you've described.
if you need a good non dealer shop for this diagnosis and repair, check out www.bimmershops.com or www.bimrs.org for options.Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.