[xxmitsu]

+
don't use sscanf to read only one integer parameter use strval.
also,

Код:

    new string[128];
    format(string, sizeof(string), "* Your car tires have been changed!");

    SendClientMessage(playerid,COLOR_ORANGE,string);

could change into this:

Код:

    SendClientMessage(playerid,COLOR_ORANGE,"* Your car tires have been changed!");

also

Код:

 if(!IsPlayerConnected(playerid)) return SendClientMessage(playerid,COLOR_GREY,"* You are not an administrator or not logged in as RCON!");;

I don't think that IsPlayerConnected will return if you have RCON-administrative rights or not.