Bad motor mounts
an earthquake
check the motor mounts
Busted motor mount.
It sounds like your motor mounts ? may have gone out.
Wheel balance, Worn steering parts, Worn suspension parts, Tire damage,
Remove the tire and wheel from your 2002 Pontiac Grand Prix. Remove the spring from the brake shoe. Remove the brake shoes. Reverse the process to install the new brakes.
You will need to compress the 2002 Pontiac Grand Am strut spring with a spring compressor. Remove the top and bottom strut retaining bolts. Reverse the process to install the new strut.
Could be a vacuum leak
Filter installed in reverse.
check your tires for broken belt++ out of round
My guess would be wheel balance.
Could be Warped Rotors. Have them checked.....
the engine mounts could be bad