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Cylinder #1 Misfire

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I have 2012 GMC Sierra 5.3.  Had to have new engine installed under warranty about 1.5 years ago.   2 days ago it started running rough at idle and eventually threw the cylinder 1 misfire code.  I swapped plugs 1-3 and misfire went to cylinder 3 with the plug.  The plug from cylinder 1 was fouled and oil'd up.  After replacing the plug last night.  The rough idle and code has stayed away.  I also cleared all codes with a scan tool.  


My question is... am I looking ahead for something bad.  What would cause all that oil on the plug.   I drove it for about 2 days with the misfire.  The replacement engine only has about 25k on it.  Plug on left is from #3  right was #1.


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I actually made a video about this! So here you go. In the video it is on Cylinder number 7. But 1 and 7 are the two that foul out.


Here are the parts you need.

Valve cover - http://amzn.to/2C5MIhd

41-110 Spark Plug - http://amzn.to/2E8oD71


Make sure you like and subscribe to my youtube channel while you are at it.




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WIll this fix the problem on a 2013 silverado xfe?


code 015b

just replaced plugs and wires. Is this something I should do also?

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