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you can do it by adjusting the Idle speed control to fight itself and constantly search for idle. It does this by rapidly advancing and retarding the timing. See the below screenshot. While you may fool a couple of people, most car guys will tell right away its fake, and others will just think something is wrong with your car.
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2018 GMC 2500 "Blue" (Sold)
2018 ZL1 1LE Hyper Blue" (Sold)
2018 CTS-V "Black" (Sold)
2022 GMC 2500 "Blue"
2022 ZL1 1LE 6spd "Rapid Blue"
2023 ZL1 1LE Auto Rapid Blue (ordered)
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