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+2 on checking compression.
Not sure what the code means.
Do you have an aftermarket intake or filter installed? May be worth it to clean the MAF sensor just to knock that out.
My PCV is in a similar state appearance wise. So while it might not be in top shape I don't think it's causing problems yet. Simply removing the vacuum fitting on the manifold may cause leaks as the o-rings deteriorate so watch out for that.
 

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Yikes! Has or does anyone know if you can use seafoam on that with the manifold installed - without contaminating oil or making things worse?
 
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