why does my idle go crazy only when i start it

[240sxspeedracer1]

pretty much the title explains it.  
I go to a store and turn off my car.  when i turn it back on while the car is still warmed up, the idle jumps around at around 5k

[camppain]

well ive posted in topics like this one before there is a bulliten out issued by nissan for this (you only know about it if you work for them, it helps u do your job better and isolate certain problems) back to the subject at hand
try a search for idle ive been lazy to scan the bulletin but i will try in the next month or so along with a hud diagnosi write up