Intermittent rough idle, hard starting, oil consumption. Not getting smoke out of exhaust but alot of vapors/fumes. Getting huge plumes out the back on a cold or humid night. I put a catch can in a while ago. wondering if during routing the hoses I unknowingly messed with the pcv system and did something to cause these symptoms. I tried blowing into the pcv valve and air was flowing into it. Isn't the pcv valve supposed to be a one directional valve? Can a bad purge valve or vent solenoid be the issue? Any ideas?