[danny8]

when you raise utg and get a 3bet from the blinds they usually have a premium hand. mostly JJ+, AK+. if you 4bet you'll prolly lose all but AA/KK. you cant 4bet/fold since sometimes hes gonna be shoving with AK and with all th emoney in the pot foldings a mistake. if you're 4betting you're doing it for vaue so call a shove.

However i'd just call his 3bet and see a flop.

EDIT: if i have KK here i'd 4bet most of the time, and rarely just call. not sure what i'd do with AKs, since you have position i'd prolly call and see a flop.