I've been trying to figure this script out..
I downloaded from AU Resources
Physics System

and what I would like to have the action physic_car do is move just like the action car_ai with key controls

For example if(key_w && my.speed_x < 10){my.speed_x += 0.2;} //move forward
etc.

I got the car to move with key controls, but now the car bounces all over the place any ideas on how to prevent this...