Everything your saying says leak after the MAF man. Unmetered air getting in somewhere. How's the pipe between egr and manifold? Can of brake clean is in order at this point. Fire it up, spray around intake with brake cleans until you hear the engine idle up on its own and you'll have found your leak
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A SS looks like it could kick your ass if it wanted to, but a WS6 looks like it's coming over to do it
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