hello guys and gals. had my turbo back on the road for about a month. problems have arisn....

the oil cap and dipstick pop off quite alot....
i took the boost hose off today and sum gunk is present....

turbo is a new unit, water is fine, oil is fine.

could this be down to breaathing system blocked?

engine has very poor performance sometimes too, could this be causing this??

any help woiuld be great thanks alot :0