Possible causes of automatic transmission kicking when shifting gears:
Throttle valve malfunctions:
* Contamination or wear of the throttle assembly
*Faulty throttle position sensor
* Incorrect throttle clearance adjustment
Other possible reasons:
*Low transmission fluid level
* Worn clutches, gears or solenoids in the automatic transmission
* Contamination or blockage of the valve body
* Faulty transmission control module (TCM)
*Wiring problems
Possible solutions to eliminate automatic transmission kicking when shifting gears:
Throttle valve troubleshooting:
* Cleaning the throttle assembly from dirt
* Replacing the throttle position sensor
* Throttle clearance adjustment
Other possible solutions:
* Checking the level and replacing transmission fluid
* Repair or replacement of damaged automatic transmission components
* Cleaning or replacing the valve body
* Diagnostics and reprogramming of TCM
* Checking and repairing electrical wiring
It is important to note that the exact diagnostic and repair process will depend on the specific vehicle model and automatic transmission. It is recommended that you contact a qualified mechanic for proper diagnosis and repair.