Problematic Audi

Just replaced spark plugs, coils, valve cover gaskets, and resealed lower oil pan. Started car up and it was missfiring bad. Got codes p0300, 302, 303, 304, 306 (300=multi missfire and the 2, 3, 4, 6 are specific cylinder) and 0441(evap system, incorrect purge flow). So I went so far as to pull all spark plugs back out and double check everything which looked good and put it back together.
Started it up and had a missfire again this time with codes 300, 301, 302, 305, 306.
The only thing I could find was the crankcase breather hose on the left side(driver side) attached to the valve cover was broken(seperated in 2) right at the flexible part. Will this cause a missfire? I don't know if the hose was already damaged before, being that I just noticed it. Would appreciate any help. Thank you

audia4turbov8

see if the vacuum pump is broken thats what happened to my 1.8t and i thought it was the coils but it was the pump

Problematic Audi

Thanks, I'll check that. Was your 1.8t misfiring and/or throwing misfire codes?

tofast2belast

yes it can cause misfire. it is then introducing unmetered air into the intake system.

thus causing misfire.

audia4turbov8

ya it was misfiring and throwing codes