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check engine light still on after changing engine plugs
also service 4 wheel drive light on
Vehicle: 2002 gmc yukon envoy envoy 4.1

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Engine misfire can also come from the ignition coil or its sparkplug wires, Determine what cylinder has the misfire condition , this would narrow down the cause for the misfire condition.

​ The distributor cap can also short together with each other so the cap should be tested  , it does not have to leave carbon traces

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