Background info...
1991 5.0 5 speed
My middle brothers mustang is having an idle problems. When he starts it up it's fine for a second and then jumps to ~2000 RPMs. Sometime's it corrects itself, sometimes it has to warm up first. He says sometimes between shifts it does the same thing. I guessed IAC or the equivlant on a ford. I'm about to start researching mustang boards, anyone got a suggestion?