Hrm, it was warmed up a bit? That changes things a bit.. the only suggestions I can think of for now is, get the computer codes just in case, and maybe try cleaning the IAC (idle air control). This video shows you how to get any error codes from the computder, its easy and free with no special tools :
As far as the IAC goes, its ust a couple of bolts on the throttle body and clean it out good with something like a toothbrush and some carb cleaner. Chances are good that you will have to remove the throttle body to get it off tho. Hope that helps.