Weak TP, weak kicker - How do you play this?

[mpfree]

Sorry, hand converter is not working well, but basically, everyone except Hero, UTG, and MP3 are in the hand.

No reads on UTG. MP3 seems passive post flop and seen him just call down with draws and mid to low pps.

I don't really know how to play these hands. Is betting out
with this correct? Or is this what SSHE calls 'reverse implied odds'?

Should I have have bet out again on the turn since I bet the flop? If UTG had folded on the flop, I would have continued, but I chickened out and gave up.

Thanks.

Party Poker (10 handed) converter

Preflop: Hero is BB with 8[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img].
<font color="#666666">UTG calls, 4 folds, MP3 calls</font>, Hero checks.

Flop: 4[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
Hero bets, UTG calls, MP3 calls.

Turn: 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG calls, MP3 calls, Hero folds.

River: 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG bets, MP3 folds.