Possible reasons for automatic transmission jerking:
Transmission fluid problems:
*Low fluid level
*Old or dirty fluid
* Incorrect fluid viscosity
Transmission problems:
* Worn or damaged clutches
* Clogged torque converter channels
* Faulty solenoids
*Damaged gearbox housing
Electronics problems:
*Faulty throttle position sensor
* Faulty speed sensor
* Faulty Transmission Control Module (TCM)
Other reasons:
* Clogged fuel filter
* Faulty spark plugs or ignition coils
* Faulty catalytic converter
* Worn engine or transmission mounts
* Faulty torque converter