I have a 2013 honda civic auto transmission 1.8L engine. New to me. When gradually accelerating, somewhere around 18 mph I feel a vibration. I pulled the "torque rod" motor mount on the bottom of engine. I do not see any visible tears in rubber. It seems pretty stiff so I'm thinking about reinstalling. 18 MPH, is this a tail tell sign of a specific part that's bad such as some of the motor mounts on the top? My hope is it's not the transmissions but any advice would be much appreciated.