2000 silverado 1500 misfiring badly. getting P0300 random multiple misfires detected and P430 catalyst system efficiency below threshold bank 2. Changed plugs and wires. What could be the problem?

Asked by Sep 13, 2014 at 12:02 PM about the Chevrolet Silverado 1500

Question type: General

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http://engine-codes.com/p0300.html .P0300 is a vague OBD code that I counted 10 possible causes. See the link

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