why my car slightly shakes when i keep my foot at brakes at red light after 1min on 2008 Honda Accord

it doesn't happens when i put my car in "parking"

2 answers
It could have bad engine mounts or an engine misfire (spark or fuel related) that just is marginal enough that it has not set a Check Engine Light. Is the idle speed sufficiently high enough?
ck motor mounts may need tune up