Change out the DME temp sensor (blue top) cheap and easy and critical for the DME to know when to richen or lean the mixture for a cold/hot starts. Another potential issue is a vacuum leak (unmetered air), or your
TPS isnt working properly and its not telling the DME you are in an idle state.
More info and testing information here:
https://www.clarks-garage.com/shop-manual/ts-01.htm
ICV/AAR is more related to erratic idle issues, and one way to test it is to hook up 12V and make sure its opening and closing without impediment (it should cleanly snap open and closed). Usually these fail because they get full of gunk which restricts their operation, and can be sometimes cleaned with carb cleaner. I am not sure why you would put it in a freezer as it is not controlled by temperature, so thats confusing as to where you got that from. Regardless, I recommend your DME temp sensor gets replaced (they are like $15) and if that doesnt resolve it, look for vacuum leaks/smoke test and test your TPS.