Collapsed AAV hose

Naturally aspirated tech and talk
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c5_pilot
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What would cause the Aux Air Valve hose collapse? Cold idle is low (700) but stable , revs fine and idles perfect once warm. No surging idle, ohms ON AAV good so not typical AAV symptoms so not thinking the AAV just yet.

Car ran flawless till parked a few mths for maint on various things. Installed new radiator, removed intake , AOS etc all apart for service, so many suspects here. Throttle cable adjusted properly for cut in/out

AAV is newish , a few yrs old with less than 1000 miles so dont see it gumming up while sitting but have yet to remove to see and clean as I just got everything back in place. Car sat months between drives over past 15yrs with no issues. More baffled by hose collapse than idle but sure its related. Hose is not rotted.

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