Engine miss.
If your car shakes while underway, your tires have worn incorrectly from misalignment. If it shakes while in park or not moving, your engine is misfiring.
Drive shaft is going out
Need more info like what is the vehicle doing when it shakes, is it idling in park, driving down the road, braking, driving at highway speeds, etc.
if you car shakes when its fully stopped it may be the harmonic balancer, take it to a garage. is it shakes only when you are braking while stopping than have you brakes checked
I had this happen on my 2002 Cinco at 40,000 miles. They replaced the motor mounts under warranty, and it fixed the shaking.
Carburator problems -- dirty gas -- water in gas
replace spark plugs or check under distributor cap for moistore
If you are walking with no car, how can it be in Park?
I would suspect the park pawl gear is broken.
Check the egr valve to see if it is clogged, and look for vacuum leaks. These would be the two most common places to start.
If a car shakes during acceleration the brake rotors may be damaged. If the rotors are damaged they will be unstable as the tires rotates making the whole car shake.
If your car shakes when stopped in drive but not in park, it may indicate an issue with the engine mounts or transmission. Worn engine mounts can allow excessive engine movement, causing vibrations during idle in gear. Additionally, it could be related to a vacuum leak, misfiring engine, or problems with the idle air control valve. It's advisable to have a mechanic diagnose the issue to ensure safe operation.