General Situation - Pair + three flush

[AceofSpades]

I call on third street with a K [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/diamond.gif[/img]9 [img]/images/graemlins/diamond.gif[/img] three flush,
three others call, on fourth I hit 3 [img]/images/graemlins/spade.gif[/img]

X X A [img]/images/graemlins/heart.gif[/img]Q [img]/images/graemlins/club.gif[/img] bets and two others call.

How strong is my hand? Strong enough to call one more bet in a multiway but not to raise? is this a fold?

If I blank on 5th is this an automuck? What about if I have an overcard to the top pair hands?

any advice on the strength of three flush with a pair say with two dead flush cards in general?

Thanks