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420A CEL (P0300)

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mods are as profile states. I have a 190lph autolite plugs and ngk wires they have 10-15k on them. other than that nothing.

is there any way to tell for sure what the cause of this code is? I have searched and there are so many different solutions that worked for people.
 
well today I took it into the shop to hook it up to an OBD-II reader (not just a p code reader) and through some of the diagnostics on there everything looked fine. So I turned it off and started it up again and low and behold it started and ran fine and I have yet to have the light come on again since clearing the code...
 
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