It's happened to many times to be coincidence, on both my Renix and HO. Charging system issues, either the alternator or the battery shows up as a lazy or sticky IAC.
Over a dozeb times now I go to start and the IAC sticks closed and I have to give a little pedal to get it started. Awhile later (days or weeks) it will periodically stall at stop lights. Eventually an alternator or battery problem becomes bad enough to be noticed, in other words a sticky IAC can be an indicator of charging system issues. After fixing the electrical system on numerous occasions, the IAC worked well again without a hiccup, which leads me to believe I'm right about a charging system with issues causing IAC issues..
I don't remove the IAC in the HO to clean it. I glue the nozzle extension onto a push button in a can of brake cleaner (true solvent not the new environmentally friendly stuff) and spray it into the IAC opening while the motor is running, working the throttle a little as I spray. Then I spray a coupe of squirts of a quality spray oil (synthetic) into the opening. I repeat couple of times a year as a prophylactic. Gluing the nozzle extension on can save some real grief, I almost lost one down the TB throat once with the motor running.
I try to avoid spraying solvent behind the IAC piston, there is some sort of factory grease on the tiny gears and threaded rod. I do let few drops of synthetic oil flow behind the piston on the Renix IAC, the grease gets thick with age.