oh hi,
i made it month ago with help of a friend: aNorthStar
and i replying this for other who may need.
its impulse
jump button in player controller fires the RPC **Vehicle Jump **and it checks “is vehicle on ground?” so in air we got no jumping.
Then the car jumps with Impulse but still spinning in air and the problem was center of mass 
by fixing that the car jumps like a character :]