my GTR is breathing!

[BZERK32]

Hello poeple

it seems my 32 GTR is "breathing"

i can hear through the POD filters a sucking and blowing noice..

should this be happening when my car is just ideling???

also it seems to be running a bit rough.. i have recorded the sound of the exhaust at idel (where can i upload it?)

its also very loud and it blows heaps of air out of the exhaust compared to other GTR's.

The old plugs had a lot of carbon build up on the and it is runngin very very rich.,. (almost passed out from the fumes)

does it just need a tune?

could a coilpack be stuffed and making it run a bit ruff?

i have changed all the plugs and cleaned the afms.. this made no differnece

any help would be sweet

[BZERK32]

ps.. its got a big muffler and a 3 or 3.5 inch cat back (jasma exhaust)

[BZERK32]

so are these noises normal??