i bought a pcv valve for my 1994 altima and i was told the pcv valve is located behind the intake manifold above the oil filter you cant miss it. i took off the valve and its a different kind of pcv valve connected to two different size tube clamp together. i tried to install the new pcv but the tread size is too big but i went to like 5 professionals and they said this is the right part. can there be a chance the intake manifold is modified or sumthing or i took off the wrong part even if thats the only part on the manifold back there thats connected to tubes? can anyone help with this problem?