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I would check MAF first, than O2 sensors. My car did this, as the previous owner had all the O2 sensors before the cat. I "kinda fixed it" with a spark anti fouler for the "rear" O2's. It never threw a code for the O2's, and would have random misfires with the exception of 1 of the cylinders(think it was #1). But now I still get a misfire every now and than, but only when I am at a lower speed with a low constant RPM. I plan on getting this fixed, but do not have an inspection for 1.5 more years. When I get time and more welding skill I will attempt to fix it.
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