There's definitely a problem with the car - you're most likely getting a misfire from the way you describe your symptoms. If you dealer won't diagnose the car without charging you, I'd find another dealer! Hey, at least it's not $135/hour!
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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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