Steal with K4s?

[Womble]

----- HOLE CARDS -----
dealt to womble [4[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]]
GreyDeath: folds
Boshmosh: folds
Dautovic: folds
tovarich: folds
womble: raises £1.50
ence: calls £1 (40/18/0.89)
----- FLOP ----- [J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/heart.gif[/img]]
womble: bets £1
ence: calls £1
----- TURN ----- [J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/heart.gif[/img]][5[img]/images/graemlins/heart.gif[/img]]
womble: bets £2
ence: raises £4
womble: folds

Should I be stealing with K4s? I think this was a bit too loose since he calls alot PF. Was my postflop play ok? The flop bet is mandatory but how about the turn follow through? If I had A4s would this change the postflop play? (definateyl correct to attempt a steal)