http://www.toyotanation.com/photos/s...php/photo/7850
Just grabbed a pic from the gallery... Part in question are the blue lines and their associated 'stems' at the top of the picture, near the oil filler cap... I believe its a vacuum line of some sort.
My 5S-FE was hesitating strangely on quick acceleration from a stop (usually turning left) and I investigated the transmission and the throttle body for a while before I found one of these 'stems' was popped up about 1/2" off the block.
I pulled it out to figure out what it was and noticed it seems to be cracked a little in a few places... I kinda shrugged it off and put it back in place with a nice satisfying click feeling as it seated, but it has since worked itself loose again a couple times (over several months) - and always the same one.
A huge no-prize goes to anyone that can tell me what this is so I can get it replaced