Physics Vehicle - What I'm doing wrong?

Hi guys,

I did Physics Vehicle just like in a CS2 Tutorial, but it moves in a Very weird way.

Can you please tell what I'm doing wrong?

I've attached the project file:

https://drive.google.com/open?id=18gVbU73Qvilv9pdmZtVpbTjr53R9R_8L

Create revolute joint from BackWheel to CarBody. (Not from CarBody to BackWheel)

And the same for FrontWheel.

Create revolute joint from BackWheel to CarBody. (Not from CarBody to BackWheel)

And the same for FrontWheel.

Thank you