Since he's 4betting here his range has to be 2pair or better. What remains of his UTG limping range at this point is 88, 99, A9s, A8s, AJ. A 26/17/1.3 isn't all that unreasonable and therefore probably has some idea of basic poker.

pokerstove says this:

Text results appended to pokerstove.txt

616 games 0.005 secs 123,200 games/sec

Board: 9h 8h Js Ac
Dead:

equity win tie pots won pots tied
Hand 0: 45.455% 31.17% 14.29% 192 88.00 { AhJc }
Hand 1: 54.545% 40.26% 14.29% 248 88.00 { 99-88, AJs, A9s-A8s, AJo }

If you've never seen him bluff and don't think he has any other hands worse than yours it's a fold.
As spoon said, you have to figure out his stacking off range. You're never 3betting here with the intention of folding afterwards. With that said, I'd make the 3bet bigger if I am stacking off here. If I'm not happy about stacking off here I'm calling the raise and re-evaluating on the river. a 1.3AF isn't someone who bluffs much and their raises like this are probably not going to be on draws.