Intermittant vibration at 30mph like driving over a rumble strip. Can happen above 30 to 45mph. Does not happen all the time.
Bad tire, unbalanced driveshaft, bent wheel, bent hub… Need more car and problem info if you want me to narrow it down.
Sounds like torque converter shudder.
My first thought is the torque converter also. That was a common problem for Hondas and Acuras of that age.