2000 Chrysler Cirrus thumping noise while starting and ratt

When I start my cirrus there is a disturbing shake while I am turning car over. It cranks right up just sounds like it has something wrong with starter or motor mounts, but not sure because there is a noise that sounds like a marble dancing around under the hood also. Any help would be appreciated. Sound fine when giiving acceleration no rattle just when you released the gas you can hear rattle good