[XStormiest]

pawn Код:

new FPSlimite = strval(params);

serious? you transform an intergrer into integrer , why you do this?
strval is for transforming strings into integrer

you may use

new FPSlimite;

also a new problem playerid is the player who have that fps, so the command won't kick player who have low fps , will kick the player who type the command if he have low ping
you should loop

like

pawn Код:

///also this should be in the callback timer not into the command.
for(new i = 0; i < MAX_PLAYERS;i++)
{
    if(GetPlayerFPS(i) < FPSlimite)
    {
        SetTimerEx("FPSKicker",5000, 1, "u", i); //customize this to your time ...., 1 is for reapeting this one
    }
    return 1;
}