I'm with Dave on this , your complaint sounds familiar, from another post, and if memory serves the problem was an non transferred piece from the original valve.
Kind of a muffler / diffuser .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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