Where is the pcv valve located on a 1999 Nissan Altima?

It is locate on the passengers side of the car below the intake manifold near the 4th cylinder it is a bear to get and replace. Recommed that you use a mechanic but, it has been suggested that you remove the serpentine belt and the oil filter and other parts underneath to get to it from the bottom....I prefer to remove the intake manifold and get to it from the top but this requires more mechanical skill and less time. it sits about mid engine above the oil filter and buried in a little hole. it's hard to see