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here goes my $0.02
C is the oil filler tube. the accordion sections are known to crack and leak, and eventually create a vacuum leak leading to a CEL. While you are at it, remove the tube, have a look at it and replace as necessary. My money is that it breaks in two when you are removing it, it gets that brittle.
A,B,and D are leaks coming from the rubber joints in the intake. Those flex around as the engine revs. Hey, if that's the intake, how'd oil get in there??? Great question. The air-oil separator goes bad after a while and I suspect yours is still in the "good" range, but letting some oil pass through. Pull the throttlebody and have a look inside the intake "T" pipe. A very light coating of oil passes inspection... puddles of oil do not.
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Rennzenn
Jfro@rennzenn.com
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