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I'm going to solve your issue right now... it's carbon buildup. I had the EXACT same thing and the carbon cleaning solved it immediately. Despite me literally telling the dealer that it was carbon, they went through everything else that has been mentioned in this thread before finally breaking down and doing a carbon cleaning. I was ripping pissed because they kept my car for over a week to diagnose an issue that I told them about at the start.
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2018 Jeep Grand Cherokee High Altitude Hemi | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold
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