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Need more details about the misfire before we can help you. If it happens under hard throttle and is all cylinders yeah it could be fuel starvation. If it's just one cylinder, not that likely. Also swapping coils will only help you with the latter symptom not the first.
You could ask the dealer what led them to their conclusion...I kind of think they're taking a shot gun approach by recommending both plugs and coils.
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'08 X5 4.8i - 190k
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'94 325i - 208k - Sold
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