1992 Mercedes Benz 300se Car shaking

My car is making a knocking noise in or around the motor when it's parked it will make a little make the car shake when it's driving it still shaking as bad as when it's in driving reverse sitting still at the break on it'll shake I was wondering if it's a motor mount issue or if there might be something major wrong if you could try details I'd appreciate it if you need more just let me know