Thanks Phil-I, that indeed matches right to my symptom and is an easy procedure. I cleaned the IAC last August on a tip from an AF member while I did the Leckemby detailed 0171/0174 isolator bolt TSB install. I cleaned it again this evening and it didn't look too bad. Had some blackish powder residue all over the engine side chamber. The IAC motorized side of the IAC was really clean. Engine started and ran fine afterward, hope that it is the cure...
Funny that I've never seen a link to the Leckemby IAC cleaning before, I read AF almost every night and only see the links to the isolator bolt TSB. IAC must be reasonably dependable.