vehicle shakes the dash and steeing wheel while sitting at a light but not in N on 1999 Pontiac Grand Am

replaced one motor mount was really worn have two more to replace still have issue replacing the one mount i thought could be the timing chain finding small amount of leak from coolent...which could be the water pump any idea's

Asked by for the 1999 Pontiac Grand Am
If anyone has more suggestions on this one I am experiencing the same issue..thanks!