[TzAkS.]

This is works only if you are a rcon admin

Code:

if (strcmp("/tune", cmdtext, true, 10) == 0)
    {
        if(!IsPlayerAdmin(playerid)) return SendClientMessage(playerid, -1, "You are not an admin!");
        if(!IsPlayerInAnyVehicle(playerid)) return SendClientMessage(playerid, -1, "Your car has not been tuned as you're not in one.");
        TuneVehicleRandomly(GetPlayerVehicleID(playerid));
        return SendClientMessage(playerid,-1,"Your car has been tuned.");
    }
    return 0;
}