Breather O-ring as a source of vacuum leak?

[rob101]

g'day everyone,

my PCV hose was off the engine since i replaced the rocker cover gasket, anyway i must not have hooked it up correctly as when i changed the oil this afternoon it was completely off, but i didn't notice a difference in rough idling it was as rough as usual,

So the question is, is it likely that my vacuum leak is coming from a leaky PCV hose o-ring?

[632 Regal]

maybe, is it loose?

[rob101]

yeah a bit, i might change it anyway it seems it could be leaking oil anyway.