villain is 33/16/5/1.47
His play indicates that he hit the ace, but AK is unlikely.
I think I get value of weaker aces, overplayed Kx (and bluffs of course) and loose to 2 pairs or better.

a bluff is unlikely since he flats teh flop.. with what hands would he? A8? fd wouldnt shove here if he only flats flop so probably fold in this spot mos of the times..

I fold too, because i do not think this ever is a bluff..
However you are getting ok odds, he has raised 33 more and the pot is 51$.
So you have to invest 33 to with 84.. If you think he shows up with a draw 1 in 3 times you can definately call here.
However i think he has you beat here.

I called and he showed me A3o which held.
I have to admit it was kind of an impulse call that I made.
Which I forgot to mention is that villain instant check shoved me, which is a tell that he hit the ace.
Most of the times players holding a set, wait for a moment before they shove.

So, I made the call because I believed he hit the ace and wasn't holding AK. Imo the error I made it that the villain is not very agressive, which indicates, together with his play, a strong hand.