17705 , misfire codes and pre 02 sensor codes stored. smoke test and found dipstick funnel cracked. 02 code was for slow response. test diverter valve and want hold vaccum. diaphragm has hole in it. replace dipstick tube, diverter valve, breather tube at engine block , pcv valve and hoses at pcv valve. Perform throttle adaptation. 17705 code and misfire codes are back with a rough idle. Seems like a big vaccum leak. Smoke test again and no leaks found. Perform battery reset nd still idles rough with the same codes. I can pinch hose at intake hose at air filter that goes to ocv valve and it idles fine. pinch hose at intake that goes to pcv valve and it idles fine. I'v recheck everything again and I am missing something. Been working on Vw's for many years and I'm stumped