Does anyone know why my 95 240 shakes a lot when I start my engine and engine also shakes for about one second when shutting down or is it just normal for this kind of car?

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I've got a 91 240sx se with the same problem and a friend with a 95 maxima with the same problem. After checking everything known to man I found out by Nissan, that is was the Knock Sensor which controls the timing between the starter and the flywheel.

Good luck,
Joe Hedges