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I have an AT '16 FR-S also. Can't say I know about shaking after I start my car. Do you mean as soon as you turn the key over, or after it drops to idle? If it doesn't continue I wouldn't see a reason to worry. Just fill it with premium gas when it gets low, maybe the fuel isn't up to grade? You'll have to be more specific with how severe the shaking is and if you can feel it or maybe your windows just kinda shake.
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