Flop play with 99 vs TAG?

[AlmightyJay]

Can't get the converter to work, so here's my manual attempt:

Party Poker 1/2 Hold'em (9 handed)

Preflop: Hero is MP2 with 9[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]
1 fold, UTG+1 calls, 1 fold, Hero calls, <font color="red">MP3 raises</font>, 3 folds, BB calls, UTG+1 calls, Hero calls

Flop: (8.5 SB) J[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="blue"> (4 players)</font>
BB checks, UTG+1 checks, <font color="blue">Hero...</font>

First of all, I know a lot of people raise this hand in this spot. Sometimes I do. Usually I limp in EP/EMP, though.

MP3 is a solid, somewhat straightforward TAG. I respect his play, and I think he respects mine. His range here is probably TT-AA, AT-AK, KQ, maybe KJs (though this might be iffy because I'm in the pot.. I don't know if he limits his raises based on who's in the pot). He will bet this flop no matter what he holds, but if he's got UI overcards on the turn, he will check it through. If I bet, he may also raise no matter what he holds, but I'm not positive.

To me, I figured I either needed to check/fold this flop or bet right out, hoping MP3 will raise to try and limit the field. I'm looking for more opinions on how to play this one, because I felt lost when the flop came.