Limping doesnt help here, as rondavu stated you have to be pretty certain that there will be a raise, and even then OOP I would go for a re-raise, at least with KK. If you raise with AA/KK/QQ and they have cards they will call, but if you dont someone with 99 will perhaps just call and that gives better odds to the next players to call to see a cheap flop, and then you my friend are screwed. Like I said I dont raise TT and JJ EP, anything better I raise to isolate..