Random miss fire in all cylinders - Scion Forum
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post #1 of 1 (permalink) Old 02-14-2017, 09:39 PM Thread Starter
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Default Random miss fire in all cylinders

I have a check engin light coming on for Code P0300, PO301, PO302, PO303, and PO304. It is a random miss fire and it is detected in all cylinders. I checked for a vacuum leak and the mass air flow sensor. There is no codes for EGR valve. Does anyone have any ideas what this could be. I have changed the spark plugs and the valve cover gasket.
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