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The infamous n54 idle shakes. Almost everyones got em. Troubleshooting options: spark plugs, coils, injectors!
Did u get the injector recall done already?
Some techron should help periodically.
It's usually the spark plugs though, if not people have a bad injector or two, otherwise it's the coil packs acting up. Don't depend on the dealer completely to diagnose because they will run you in circles, tell you it's normal, or tell you "unable to duplicate customer concern" or some amateur hour bs like usual
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