Okay, folks. What would cause a car engine to misfire at idle after the engine is warmed up?

It's a 2009 Chevy Malibu. You can definitely feel it while sitting at a red light. There is no CEL, by the way.

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I'd start with the easy stuff, unless you've had them replaced in recent history - plugs and ignition cables. from there it just gets more and more expensive [to check, even.. double down to fix]