Well the trucks got 126,000 on it now and was starting to idle a little crappy so I pulled of the IAC and wow there was quite a bit of soot in there. Just used a rag to wipe out what I could reach then I looked in the manifold where the IAC bolts up and cleaned that too. It surprisingly made a huge difference in my idle, doesnt stumble as bad as it used too. So if your having a rough idle you might want to check this out.
Bill