* A problem with the transmission. The transmission is responsible for shifting gears, and if it's not working properly, it can cause the car to jerk.
* A problem with the engine. If the engine is not getting enough fuel or air, it can cause the car to lose power and jerk.
* A problem with the brakes. If the brakes are not working properly, they can cause the car to slow down suddenly.
* A problem with the wheels or tires. If the wheels or tires are not properly aligned or inflated, they can cause the car to jerk.
If you experience your car slowing down and then jerking back to speed, it's important to have it checked out by a qualified mechanic as soon as possible. This could be a sign of a serious problem that needs to be addressed.
