Before missfire on all cylinders now after changing the sparkplugs and fuel filter only missfire on the 8th cylinder why??
Move the ignition coil to another cylinder and see if the miss fire moves. If so replace that ignition coil. If the miss fire stays on that cylinder it is more likely the fuel injector. Was their carbon on the spark plugs when you removed them? This is indicative that the fuel injector is gummed up.
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