If you are getting P0300 series misfire codes, your coils or plugs are most likely the issue. I'd start there. And if this is the case with the codes, the Durametric is not going to tell you any more; you need to start doing close up diagnostics to ID the source.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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