What would cause a car to shake when accelarating between 50 and 60 mph?

* Engine misfire: A misfire occurs when one or more of the engine's cylinders do not fire properly. This can cause the car to shake because it creates an uneven load on the engine.

* Unbalanced wheels: Unbalanced wheels can cause the car to vibrate at certain speeds. This is because the weight of the wheels is unevenly distributed, which causes them to wobble as they turn.

* Driveline vibration: Driveline vibration can be caused by a number of problems, including a bad driveshaft, a worn-out universal joint, or a damaged transmission mount. These problems can cause the car to shake when the power is applied and the driveline is under load.

* Torque converter problems: The torque converter is a fluid coupling that connects the engine to the transmission. A damaged torque converter can cause the car to shake when the engine is accelerating.