replace the pcv.......... dont just clean it, the ones with internal springs may not work ,simply because they rattle when shaken doesnt mean that they are not internally corroded,............... it is a cheap but vital part per fuel to accelerate efficiently. and to reduce internal engine pressure ;................ and removal to clean or replace is same amount of work with new ones are sometimes updated construction to be more efficient and durable .............. new cars with GDI should consider an oil vapor catch can or a true oil separator if they dont want to clean the system out every 1 to 2 years,