* Dirty transmission fluid: Change the transmission fluid if it is dirty or smells burnt.
* Faulty shift linkage: Inspect the shift linkage for damage or wear and replace it if necessary.
* Faulty transmission mount: Inspect the transmission mount for damage or wear and replace it if necessary.
* Faulty shift solenoid: Test the shift solenoid and replace it if it is not working properly.
* Faulty transmission control module (TCM): Scan the vehicle for trouble codes and check the TCM for any problems.