102k miles on 2000 mustang ?
well 102 is actually low for something this age, when you do the math thats about 11.333k miles a year. what your looking at has an essex 3.8l v6 with a 4-speed auto. heres more info about that engine http://en.wikipedia.org/wiki/Ford_Essex_V6_engine_(Canadian) . what else you want to look for is service records, damage (especially on the frame) and make sure to test drive it, of course. make sure there's no hesitation in the trans, make sure the brakes aren't warped, ect, ect.
if it was for me, i would get it in manual, but thats a personal opinion. but if i wanted it in auto, i would go look at it FOR SURE.