Well we don't have EGR valves on these engines and I did replace my intake manifold gasket as well as the plenum gasket on the bottom of the intake when it was off. Also, I did a compression test on all cylinders and all of them are up in the 145-155 PSI range, so I'm ruling out rings, valves, and head gaskets. Trust me, I've been aggravated over this for a long time. It's probably the only thing in my life to date that I haven't been able to fix (yet).
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