Bet/call or Check/call?

[aK13]

8/16 game

I've been running bad and playing like a nit for about an hour. Villain is not insane.

8 or 9 handed

I raise 99 UTG, and get no respect for being nitty, so I get 2 cold calls and the BB.

4 way flop: 983 all spades
BB check, I bet, only MP coldcaller calls.

2way turn: 4 spade (4 flush)
My move?