BB special?

[Garland]

Opponent is very loose. He has been running really hot with crap cards, and he's shown the ability to bluff a lot. He called my preflop raise with 85o vs my AA and flopped trips. I should add that villian has made a few fishy calls.

How do you handle this situation?

Garland

PokerStars No-Limit Hold'em, $6 BB (8 handed) converter

CO ($1043.40)
Button ($318.70)
SB ($768)
Garland ($642)
UTG ($449.10)
UTG+1 ($897.05)
MP1 ($327.65)
MP2 ($615)

Preflop: Garland is BB with 6[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls $6, CO calls $6, <font color="#666666">2 folds</font>, Garland checks.

Flop: ($21) J[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Garland checks, MP2 checks, CO checks.

Turn: ($21) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Garland checks, MP2 checks, CO checks.

River: ($21) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Garland bets $13</font>, MP2 folds, <font color="#CC3333">CO raises to $84</font>, Garland ???