99 honda Passport issues

i have a 99 honda passport and i am having a problem with it. it shakes when its idleing like for example in parking lots and when i am stopped at
lights when i drive and when i start it its just fine... but i know that its misfireing somewhere i am not sure where i just replaced all the spark plugs but not the cables and i think that there might possibly be something with the O2 sensors but i am not sure what to do any suggestions?
i would greatly appreciate anyones advice.
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