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There are a lot of things, first of all you need to remember why you needed to change them in the first place.

Improper gap

wires in wrong order

wires not on all the way

wires bad

coil bad

wrong plugs

another problem with engine causing misfire.

Any system can affect the complete combustion which can attribute to a misfire code, not just the plugs themselves. Fuel filter, coil pack, fuel injectors, head gasket issues, O2 sensors, catalytic converters.

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17y ago

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