complete list of rubber parts in PCV system? 97 E420 rough idle
 

my 97 E420 has an intermittent wobbly idle issue and someone suggested that there could be an air leak somewhere, and I could replace all rubber parts in the PCV system. I'm a newbie and I'm not sure what parts consist of the PCV system, can someone provide a complete list of parts I need to buy? Also, has anyone ever posted a DIY-guide for this? Finally, how much $ in parts are we looking at?

I'm also told it'd be wise to replace the rubber seals on the air intake.. what is the part # for this?

PCV is not a term applicable to Mercedes.