Vibrations while driving and while car is parked.

If you did not change anything on the reciprocating parts on the engine or trans Then it would have to be something that failed. here are some things to check

1. slipped outer damper ring . Can be checked by putting the number one piston at the top and look to see if the timing marks are aligned

2. Cracked flexplate .

3. loose or missing flex plate bolts

4. Failing torque converter.