Hello,
Here is a police car example.
www.gamemaker3d.com/player?pid=01620776
You can take that example, remove the police car auto keys, and spawn a new car.
In order for the police car to chase the car, you need to build some algorithm to do it inside the police car.
Here is a pseudo-code:
<Vehicle name="police_car">
<Loop>
1. Check the difference between the police car position and the car position
2. Drive to the car position by changing the car steering and engine force according to the car position
</Loop>
</Vehicle>
Regards,
Cyberix3D