[SuperViper]

Stop re-posting this thread. Change your OnPlayerKeyStateChange whole function to this.

pawn Code:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(SuperJumpEnabled[playerid] == 1)
    {
        if(newkeys & KEY_JUMP)
        {
            SuperJumpEnabled[playerid] = 0;
            GetPlayerVelocity(playerid, pX, pY, pZ);
            SetPlayerVelocity(playerid, pX,pY, pZ+5);
            SendClientMessage(playerid, COLOR_USE, "Super Jump De-Acticated");
            SetTimerEx("ResetJumping", 2500, false, "d" , playerid);
        }
        return 1;
    }
    return 0;
}

and change your timer function to

pawn Code:

public ResetJumping(playerid)
{
    IsJumping[playerid] = 1;
    SetTimerEx("ResetJumping", 2500, false, "d" , playerid);
    return 1;
}