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2000 ch 427 rough erratic idle.

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Recently installed new oversized injectors, fuel lines, Return check valve, fuel filters and ran the overhead.  Truck runs amazing going down the road 33 lbs of boost and pulls like a dream but runs like its sucking air and running ruff at idle.  Seems strange but I can get it to smoothen our when I unhook the fuel supply line for a bit but no fuel suction.  Seems to be on the return side if I had to guess but everything is new.   Any help would be great thanks 

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