My RPMs are jumping all over the place causing my car to shake when i drive it. Can some one help me out?

-scan for trouble codes -check air filter --map sensor [clean if dirty ] vacuum leak --cat converter--fuel filter

The cause could be a variety of things. I would think either a vacuum leak or sensor failure.

See a local transmission shop ans ask them to drive it and see what they think.

motor mount might be bad or unblanced tires!

Out of balance tires or a bent rim.

crank sensor is tied in with the tach. you have problem with crank sensor or electrical problem. the tach reads rpms, if the sensor is bad it throws the rpms way off. this is why you get the jumping in gauge.

well i would have the catalic converter checked if it's clogged it would cause this.

Just check the transmission fluid-if low you have to add until it is full-do not overfill though. Better to have it just a bit low than overfilling it.
In park, can you accelerate to 2500-3000 rpm, and hold steady with no shaking or indications of a miss? If it runs good in park or neutral, then you probably have transmission problems. Frankly, it is pretty rare for a torque converter to develop a problem. Check your fluid, or try changing the fluid if it is dark or dirty looking.

try CV joints or drive line , CV joints for front whell drive and drive line u-joints and drive line balance for rear wheel

bad engine mount make car shake.cylinder misfire make engine shake.