Chevrolet 3500 P Codes (Powertrain) P0400 - P0499 P0455

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Codes P0300 And P0455

2004 CHEVROLET 3500
The Engine Is Misfiring And The Spark Plugs And Wires Have Been Change. I Also Checked To See If It Was The Catalytic Converter Blocked But...
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Asked by Salthesupreme

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