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2001 Ford E-150 Question: The car is giving me a trouble code for "EGR Insufficient Flow". Causes?

 

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teslacoil4148, 4.6L V8, Huntington, NY, September 02, 2011, 12:25
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The car is giving me a trouble code for "Exhaust Gas Recirculation Insufficient Flow", So I put seafoam in the intake manifold vacumn hose, and in the gas. I reset the codes and drove around a bit, and the light came back on, so I ran the code reader again, and it gives me the same code. What are the possible causes, how common is each, and which component should be checked first?

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