I noticed that I tend to swing between P and J. I normally see myself as and INTP, the description fits me very nicely, but when I feel good emotionally I tend to swing into the J. Especially so when it comes to formal business situations. I love job interviews - I love the feeling of being the center of attention, but only when a single other person is involved and when that person is asking questions that I can come up with long detailed answers to. I have taken several different tests on several occasions and 3 out of 4 times I'd get intp, otherwise intj. It's not like I'm all going "omg i'm intj I don't want to be intj". I just wander if there is a theoretical explanation for this.