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sorry for the thread necro, but did you guys ever figure this one out? i have a 2013 LFX with only 5800 miles on it, and it's been doing this for awhile. since i hardly ever drive the car i haven't yet bothered to bring it to the dealer to look at it, but it's exactly as you describe. when the car is stopped and idling, it will occasionally drop RPM from about 600 to 400, shakes a litte and sounds like it's gonna die, then spike rpm to 1200, then drop back to 500 steady. i'm fine with this if it isn't hurting the car, but feeling like your car is gonna die at a stoplight is really annoying.
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