(this is my first post so i guess this is the best place for it.)

theres no real say on when its gonna happen. seems more often to be when i get off work (at 1am). it happens only when im driving and i can feel it through the steering column and the pedals. it almost reminds me of going over rail road tracks. and i can hear a faint noise also similar to going over rail road tracks. no changes to the car/ environment has been made to warrant this odd behavior.

some ideas that are floating im my head: bad shocks (stock) or bad tires (only 1 yr old)
could it be as easy as someting needing tightened? it is a old car

any insight? thanks