88 vs. a PF cap

[synbad13]

So my main question is how often do you look someone up in this spot (with the knowledge they may have AK).

Full Tilt 1/2 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is CO with 8[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">Button caps</font>, <font color="#666666">2 folds</font>, MP folds, Hero calls.

Flop: (11.50 SB) Q[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Turn: (6.75 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

So Assuming Villain bets, how often do you call down (or do anything but fold). He would definately be firing with un-paired cards if it includes a spade (which is basically just AK).

Assuming you call the turn, and a non ace/king comes on the river and villain bets again, how often do you call? (also a non-spade).

What if you call the turn and villain checks the river? Easy check behind?