there is a 90 degree elbow that eventually cracks and sucks air over time. I had the same problem and code.
The elbow is only 5/16" in diameter behind the power steering pump in the passenger side of the intake manifold. Believe me you have to look real hard. I took some alcohol and placed a rag over the end of a flat long screw driver to clean the outer surface of the 90 degree elbow. Then took some permatex high temp rtv silicone and put a dab over the cracked corner. I did replace with a new one from www.ipdusa.com. Lights out......
Cal me if you have any questions,
Colin 413.262.9221
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