[Cjgogo]

I guess this should work, tell me the results:

pawn Код:

forward SetPlayerOnFire(playerid);
new FireObject[MAX_PLAYERS];
public SetPlayerOnFire(playerid)
{
    FireObject[playerid]=SetPlayerAttachedObject(playerid, 4, 18692, 1, -0.540414, -0.340681, -1.580088, 0.000000, 0.000000, 0.000000, 1.000000, 1.000000, 1.000000);
    return 1;
}

And simply add to your command:

pawn Код:

SetPlayerOnFire(playerid);

To destroy it when the player dies:

pawn Код:

DestroyObject(FireObject[playerid]);

I DO NOT take credits for the function, I've once seen it on a thread, and I thought it would be useful for my GM as well, however I never got to use it. Try it!
ALTOUGH you first might need to use CreateObject, the function looks strange to me, use CreateObject for FireObject, AND THEN attach IT!