Mounts or sensor

I don't think the engine mount is broken, if it has excessive movement during shifting or acceleration, this could be a motor mount. Slow down shudder is when you are slowing down from high speed and the engine bucks on it's own.

Thanks, that confirmed it, it's a slow down shudder.

Yea, motor mounts don't cause vibration under normal driving, or bucking. Depending on age, mileage, heat exposure, etc., the mounts could be worn out but they last a long time and most peopel don't notice anything. Slow down shudder is something you will feel.