Sucking air as I rev it up,.!

[flmont]

I had this ( air sucking sound issue / problem)as well as Misfire codes on 4,5,6
300 304 305 306 and a P1238 (secondary fuel circuit )

1.changed plugs and coils on bank 2

2. pulled intake tubes to clean TB,..which was very oily and dirty,..I then cleaned the tubes because there was oil in them( could have added just a touch to much oil with my last change) redid a couple vacuum lines put it all back together runs a little better but slow to rev and it sucks alot of air from somewhere,.did the starter fluid trick no vacuum leaks no change in idle,but it sounds like a V8 with no air cleaner when I rev it up AOS lines seem fine AOS new last year also,..?? Thanks Frank