Ugly spot, not sure what to do

Villian is 19/15 over 26 hands

I hadn't seen him 3bet previous to this hand, but I didn't have much info on him period.

Basically, I'm not 4betting JJ pf against an unknown OOP. So I flat call to see a flop.

Villian bets 3/4 pot which is pretty much standard as a cbet IMO, but what the hell is my line here? I'm OOP, I don't have control of the pot. I have no idea where my opponent is at and there is an overcard to my pocket pair.

What do you think the best EV line is here? Mucking seems weak, Check/Call seems weak esp as I'll prob end up calling him down. Raising seems to be a lot of investment because the pot is so big.

Let me know a good line please!!!!

***** Hand History for Game 7462506389 *****
$50 USD NL Texas Hold'em - Thursday, October 16, 16:25:02 ET 2008
Table Table 126748 (Real Money)
Seat 3 is the button
Total number of players : 6
Seat 1: Lindavius ( $71.54 USD )
Seat 2: IHaveGutshot ( $69.19 USD )
Seat 3: Dakoon ( $63.45 USD )
Seat 4: Ripfel ( $25 USD )
Seat 5: ydobon ( $68.05 USD )
Seat 6: maxmad888 ( $24 USD )
ydobon posts small blind [$0.25 USD].
maxmad888 posts big blind [$0.50 USD].
** Dealing down cards **
Dealt to IHaveGutshot [ Jh Js ]
>You have options at Table 127787 table.
Lindavius folds
IHaveGutshot raises [$2 USD]
Dakoon raises [$6 USD]
ydobon folds
maxmad888 folds
IHaveGutshot calls [$4 USD]
** Dealing Flop ** [ Ks, 5h, 3c ]
IHaveGutshot checks
Dakoon bets [$8 USD]