Im pretty sure you DO NOT want to try and clean or spray anything in your MAFS. Use throttle body cleaner/spray and spray it inside and use a old clean toothbrush and scrub arround inside, open the butterfly and scrub down there too. After you are satisfied with your cleaning job put it back together. My KA did the same idle thing but I didnt get as high of a idle as your discribing. Yes there is a PCV valvle and DO NOT buy it from autozone or kragen, get it from the dealer only. I bought one cheapy one and it made my car worse, im assuming they sold me the wrong one but after that I bought the Nissan one and it worked fine. On my 16v its located under the intake manifold. The only way I could access it is by taking the fiberish shield under the car off, removing the alternator and trying to stick my hand in there from as far towards the front of the car as I could, its a very very tight space to work in plus to top it off you have to take a hose off the end of it as well wich wasnt fun. I replaced the hose while it was out since it was dried and cracked. The part and the extra hose probly cost me $15. My chilton manual (as much as it sucks and isnt specific to our car) says that it should be changed/inspected every 30k miles. Im pretty sure mine was NEVER changed untill I did it at like 108k. Hope this helps.
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