Sorry been out all day with grandkids, it’s always a good thing to clean the IACV but one thing we spent ages teaching at Volvo was chase the cause not the effect. These systems are super reliable normally and we don’t help them as they hate lack of use so un-gumming things is really important.
Teaching you to suck eggs now but change one thing and test, slow and steady and you will sort it.
BR
Colin
