I improve on the turn, so what do I do?

[damaniac]

Live 5/10 at Greektown. First live game in months, so I'm rusty and continue to assume that people are calling me with any pair, even though it appears that isn't going to be the case with a lot of people here. Game is good, a few tags to my left, fish to my right. I have a fairly tight table image, although I caught some good hands early so I've been raising a fair amount.

Villain is superstitious enough not to sell me any white chips, but folded KJ on a Kxx board to two cold on the flop (which was good given that I was the PFR and the raiser was tight as well). I don't have a great read on his own aggression however. Other players are typical LP's as far as I know.

First 4 players limp, I limp in MP2 with 54 [img]/images/graemlins/diamond.gif[/img], next three fold (Button!), blinds come along. 7 for 7.

Flop is A37, dos [img]/images/graemlins/heart.gif[/img], no [img]/images/graemlins/diamond.gif[/img], double gutter for me.

Checked to villain who is on my immediate right and bets. I call, I think the BB and an EP limper call. 4 for 5.5.

Turn card is a 4, non- [img]/images/graemlins/heart.gif[/img]. Checked to villain who bets. I should do what and why? Show work if possible.