[nezo2001]

Try this:
on the top of the script

PHP код:

new bool:Spawned[MAX_VEHICLES]; 


Under the spawn car command

PHP код:

//Beside the create vehicle type
//new car = CreateVehicle(.....
Spawned[car] = true; 


Then under the respawn command

PHP код:

for(new x = 0; x < MAX_VEHICLES;x++)
{
    if(Spawned[x] == true)
    {
          SetVehicleToRespawn(x); 
    }
} 


I'm not sure but try