ca18detottpulsarmanifold217

Clean, clean, clean.  The Gumout is your firend here.  Spray the crap out of the manifold in a well ventilated area and scrub the insides with the wire brushes.  Or you could sandblast it for quicker results.

Now disassemble the entire upper intake manifold.  Make sure to remove the EGR plate from the back of the manifold.
Clean until the ports look like this.

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