I have created a police car and imported to ue4.
All wheels have a sphere physics object and set to kinematic.
Body has a box with default options.
If i set the car on the world and click simulate the car jumping left and right side.
Privot of body is 0,0,0.
Position of root bone is 0,0,0.
See on the video
The physics engine is only called once per tick and will fail catastrophically with that low ps. Try turning down the scalability settings to get a smoother framerate, and it will work better.
Did you set the size of your wheels? It looks like the wheels have a size problem. Also let us know if you changed anything else in vehicle and wheel properties.
Btw, enable Supstepping in Project Settings > Physics to prevent any further craziness.