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Maybe go to the dealership and start up some of the new cars on the lot. They're not 2018's but the new SS's have the same engine. See if the others do it as well. I know mine does not idle smooth as silk. It's not a Honda Accord or a Toyota Camry. As long as you are not feeling any hesitating on acceleration, stalling out, loss of power, and you don't have any check engine lights coming on, I'd say it's probably fine. When I first start mine up and I'm standing behind it I can hear a definite almost misfire sound. It goes away once the engine is at normal operating temperature.
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