A-J hand

15-30 limit.


I have AJc and open limp one from UTG. The game is loose, mildly aggressive with several really bad players. There is a good player(GP) on my left. GP limps, two others limp, sb raises, bb calls and so does everyone else. we see the flop 6 handed. the sb plays every hand and is on a rush for the ages. He is up over $3,500.


the flop is J-7-4 rainbow.


sb bets, bb raises, I three bet and everyone calls! The turn is a 6s and there are now two spades on the board.


Board is now J-7-4-(6)

check to me and I bet. GP raises and gets called by 3 players including the sb.


what's your play?