Read this to see if anything rings a bell. At least do the nipple check.
https://www.cruzetalk.com/threads/2011-2016-cruze-1-4-pcv-valve-cover-intake-manifold-issues.192442/
and this
https://www.cruzetalk.com/threads/2011-2016-cruze-1-4l-pcv-system-explained.175793/
https://www.cruzetalk.com/threads/2011-2016-cruze-1-4-pcv-valve-cover-intake-manifold-issues.192442/
and this
https://www.cruzetalk.com/threads/2011-2016-cruze-1-4l-pcv-system-explained.175793/