Why does my 2004 Nissan maxima shakes when I drive

How many miles on the car? When was the last full tune up done on the car. With no codes it makes it hard, you could try cleaning the throttle body with a good throttle body cleaner such as CRC. Check the fuel pressure at the rails. If not done it may be time for a full tune up, new fuel filter, new wires, new plugs, air filter, clean the injectors.

Have tires balanced and have front end checked loose or worn parts also check for out of round tire.