With some cars, motor/trans mounts and rubber shift bushings get worn.
So now the motor is in a different spot than the shifter expects it to be,
and that affects shifting.
Worn mounts will cause vibrations at traffic lights and when stopped.
When were yours replaced/rebuilt? I have had good luck stiffening
and/or rebuilding motor/trans mounts. Did that ever make a difference!
If it turns out that your mounts are cracked, etc., pm me.-Bob