[Kia]

You should use PCVars instead of CVars, also you should made a looping task instead of making a new task each time the old task is done.

for(new i=0;i<=32;i++)

You should use get_players instead

is_user_connected(i) && is_user_alive(i)

You only need to check if he's alive.

set_user_maxspeed(i,290.0)

Speed will be overwritten at weapon change, you should also change it on CurWeapon Event.