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I changed the plugs, (they didn't look bad). vehicle only has 26K miles. engine heavily modified
Vehicle: 2004,Ford Mustang Mach 1 4.6 32 valves

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The Ford MACH 1, the octane for this has to be a minimum of 91. and this not optional it is  required., when you set a P0316 it set and with a P030X which is suppose to identify what cylinder is misfiring , Because it is P0316 and P0300. this would point to the EGR. partially open EGR would set a P0300, or a partial plugged EGR passage would set a P0300. (your heavily modified)

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