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Describe the conditions more? This car has power limiters out the wazoo and you will notice some hesitation on acceleration when it's not up to full temperature yet.
 

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I had the exact same problem when I was putting regular gas in the car. Like an idiot I listened to dealer then read the forums and owners manual that states dofferent. Once I switched to 91 octane it got much better, with only slight hesitation when extremely cold out. Then when i got an oil change with Mobil 1 car while using 91 octane it accelerates buttery smooth while at the lower speed with absolutely no stuttering or hesitation at all. Hope this helps.
 

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I had the exact same problem when I was putting regular gas in the car. Like an idiot I listened to dealer then read the forums and owners manual that states different. Once I switched to 91 octane it got much better, with only slight hesitation when extremely cold out. Then when i got an oil change with Mobil 1 car while using 91 octane it accelerates buttery smooth while at the lower speed with absolutely no stuttering or hesitation at all. Hope this helps.


Ditto, I also noticed an improvement, and did the same things you did.



However recently I noticed the occasional "stumble", perhaps caused by fuel plus changing temperature and humidity conditions? I have noticed similar problems for many years in many cars at this time of year. Or, it could be getting off the throttle inadvertently just as a gear change occurs (DCT)?
 
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