Mr.Sweets25

So i am sitting in second place at the $0,50 Turbo SnG, with 4 players to go, blinds are 100/200, and with AJ from the small blind i push all in against the chip leader ( the two low stacks folded ). Is it a horrible play? Should i only 3-bet and fold when a re-raise comes. What is the range of pushing all-in against big stack when it comes down to the bubble?