How often is this a bluff?

[Alobar]

Villian is 15/10/3 after 200 hands

I cant see him possibly having an ace here, unless I guess he made a loose call with A9s PF. 99 makes the most sense, but thats only 3 combos How often is this a bluff with a hand like 88 hoping I fold a bigger PP? What do I do?

should I just be calling PF against someone as tight as this?

PokerStars $1/$2 No-Limit Hold'em - 6 players
Hand Converter Tool from DeucesCracked.com

CO: $213.40
Button: $200.00
SB: $207.85
BB: $343.85
UTG: $200.00
MP: $374.95

Preflop: Hero is Button with T[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img]
UTG folds, MP folds, <font color="#FF0000">CO raises to $8</font>, <font color="#FF0000">Hero raises to $24</font>, SB folds, BB folds, CO calls $16.

Flop: ($51.00) 9[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
CO checks, <font color="#FF0000">Hero bets $44</font>, CO calls $44.

Turn: ($139.00) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">CO bets $42</font>,