wish i could remember the specifics

$.5/$1 home game, 7 or 8 handed

I'm SB with J:spade:, 4 .

Several limpers PF, I complete, BB checks.

Flop T:club:, 9:spade:, 8:spade:

I check, BB checks, UTG (a loose, tricky player) bets $5, UTG+1 folds, MP1 (a fish) raises to $15, folds around to me.

I cover both UTG (has maybe $50 more) and MP1 (has maybe $20 more).

What's your move?

All in. You're well over 50% vs most hands and i think you take this down pretty often on the flop with an all in bet.

There are a couple things that you can do.

If both of your draws are live (I wouldn't count on it... fish love semi-bluffing...) you have a 54% chance of hitting an out. This gives you the correct pot odds to call anything. But calling here would get you pot committed. If you miss on the turn, and one of them fires out another bet, what do you do then?

I would push all-in. This seems like the perfect position to do so. If they fold, you win a nice pot. If they call, even if one of them flopped a straight, you have more outs than you can count. The all-in move is a nice bold play.

Judging on what you said about each player, here are my reads:
UTG probably has top pair. If he had anything bigger than that, he would have bet more. The best guess for MP1 is an open-ended straight draw... like I said, fish love to semi-bluff. MP1 could also have flopped a straight, but it's a tough call. With so many limpers, he could easily have J 7, 76, or QJ. I'd say it's about 50/50 on whether he is semi-bluffing or hit a straight. Considering that MP1 only has $20 left, you aren't going to lose alot even if you don't hit one of your outs.

Conclusion: All-in is the best thing you could do here. If you get called, you have lots and lots of outs, and if everyone folds you have won a nice big pot.