2005 a4 quattro 2.0t feels like torque converter slipping but no engine codes

What is your question?

serviced trans and filter ...no burnt smell...replaced dv valve...replaced turbo control sensor have driven 300 miles no codes set, no check engine light....will a slipping torque converter always set a code? vibrates erratically sometimes violently ,sometime none at all . when smooth it has a kind of drumming/flutter sound kind of like rolling your tongue then stopping then rolling it again over and over. no leaks im thinking maybe axles or torque converter....any ideas?

What makes this problem better or worse?

Hard acceleration cause it worse..already changed plugs and coils

How long has your 2005 Audi A4 Quattro had this problem?

bought the car with the problem