[AhmedMohamed]

if you mean auto respawn every 5 mints so put that code in ongamemodeinit:

pawn Код:

//OnGameModeInIt
SetTimer("reSpawn",300000,true);

and where ever you want put that code but not in any callback:

pawn Код:

forward reSpawn(); 
public reSpawn() 
{ 
for(new i=0; i<MAX_VEHICLES; i++)
        {
            if(UnoccupiedVehicle(i))
            {
                SetVehicleToRespawn(i);
            }
        }
return 1; 
}