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[luv_my_mv6]

I've noticed lately, but been very lazy not to find and fix this problem, but today I had my exhaust manifold downpipe gasket sorted (see my other post), and thought i'd remove my plenum and check the air pipes are all ok as I have a rather nice but alarming sounding 'pshhhh' sound when I got the car upto over 4k revs and let go of the accelerator - I know this is an air leak, but for the life of me and believe me I checked every air line and vac pipe under the bonnet, I couldnt find the fault. I replaced the O rings on the plenum and no air sounds to be escaping or sucking from that area, the pshhhh noise is only evident when the car has been under a heavy load and gas pedal released so I cant get it to make the noise while idling no matter how hard or high I rev it.
 I havent got a turbo under there before anyone suggests and the air intake system - well the whole engine is standard so nothing has been chavved and it will stay that way as long as I have it   Come on lads, point me in the right direction  :-/

[Martin_1962]

Check breathers to plenum. Also check breather pipes.

[luv_my_mv6]

Checked the breathers, but no obvious leaks that I can see, the only suspect looking pipe on the plenum is the ICV main inlet to plenum, it doesnt fit as tight as it looks as it should, but I have no idling problems.... i'll scour the scrappys for a replacement and try that  

[TheBoy]

orings under plenum, and black breather box to plenum seal?

[luv_my_mv6]

orings under plenum, and black breather box to plenum seal?

Fitted new gm o rings under plenum when I had it off to check before, but the breather box I didnt remove, i'll whip it off in the morning and have another look