I have a 2003 silverado with a misfire. It has a flashing engine light. I checked the plugs wires and coil pack all seem fine. I cleaned the mass air flow sensor. I put fuel treatment in the fuel as well. It has a p0300 code. It reads the cylinders that have misfire is #5 and #6 Can someone please help.
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2003 silverado 6.0 with misfire.
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