fold quads

I wouldn't fold, I mean you have quads, and there's only one A left on the deck. What I don't like is your call to the 3bet with 99. You will hit a 9 1 out of 8 times, what would you do the other 7 times? if you get an overpair and the 3better preflop cbets what would you do?

old threat revival ?

snap call
if he has an ace, print out the hand and stick it to the wall