"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray
ISTP's seem to be a very stable group. i really haven't seen an ISTP get pissed off over much. even at their most animated/emotional they seem completely calm and rational.
You've never seen my little brother or my boss then! Both really bad tempers. But they get over it really fast. Actually, I do the same thing, but not quite to the same extent. I'm like the mellower hothead, if that makes any sense.
You have to define stable first.......As far as accountability to a fault, my money is on INTJ. They just might not feel the need to explain. Least stable...INFP. They never recovered from childhood. The used car salesmans of the emotional spectrum.
My choice istj... I guess Intuitive are someway less stable, because their are more focused on future possibilities and so the worries about future can even harder hit them.
The less stable? I go with Exfp -types
Ti- Ne- Si- Fe
Te- Ni-Fi- Se
Intrapersonal with Logical- Mathemathical I.
Cassification: brunette East- baltid^^
I was going to say ISTJ or ISTP, but I figure in high stress and emergency situations, an N might be better prepared to deal when one must stay composed and think fast and creatively to help the situation. So I say INTJ and INTP.