Honda shaking while stopped and poor acceleration?

i need help. I bought a 2008 accord about a year ago and at first everything was fine but shortly after the car started to shake when ever i stop at a light it shakes more while in reverse and drive while in neutral shaking stops and the car has poor acceleration ive done a tune up twice in one year or every 6 months and is still shaking and it seems to shake harder as time goes by… Any ideas what could be wrong?

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