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The closest thing I could find was "idle speed control". Please don't waste too much time with this. I had a "hint" of rough idle, which seems to have disappeared after I cleaned the MAF and throttle body. The IAC was going to be my next step. Looks like I don't need one, but now my curiosity is piqued about what else it could be called. By the way, the site I was looking for the part on is www.fordpartsnetwork.com Thanks