I have same problems. One day it starts up runs fine all day, next it wont stay running when cold then barely keeps a 500rpm idle once warm.
I completely forgot about IAC which I will have to take a look at. I'm glad I read this post.
Was thinking my fuel filter is bad and bought one to replace it. Think I will still change filter since it has 35k miles on it.
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Ed..
My Mustangs webpage
NMRA M/M 7222
2000 Mustang GT - 5 speed
Race weight w/o driver 3086lbs, 3250 w/ driver
Best 1/4mile run to date: 12.79@105.96, 60' 1.76sec.(10-27-02) Best MPH 106.03(10-27-02)4.10gears
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