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rdartua

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  1. rdartua
    Dude - any luck figuring this out? I have same damn issue on 6.2l 2008 Denali - took same course of action across the board - even replaced exhaust manifold with new gm gasket. I do run NTK o2 sensors though - all 4. Not sure if this could cause an issue. honestly maybe we sould use O2 sensor extension tube?
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