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I know that this thread is old but I want to thank DIYGuy for the detailed explanation. My 2017 1LE 1SS (18,500 miles) is doing this same thing and getting progressively worse. It has some mods including a Tony Mamo ported/polished TB that was installed very early in the car's mileage. I still have my original TB in the basement, I'll swap them this weekend and report back on what I see on the Mamo and how it drives with the stocker.
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