08 pathfinder shakes a little when starting up from cold
that’s 12-years old car…
I’m not young and when I’m starting up in the morning shake a little bit too… 
you have to give more details to get any meaningful answer/advice.
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I’m not young either and when I’m starting up in the morning shake a little bit too… : I don’t shake but I have to prime myself with coffee to get started.