I have a 08 Yukon with 5.3L I noticed it was using oil not running bad or smoking or anything. I then noticed the CEL came on then was off the next day so I went on then a few weeks later it came back on again with engine misfire cylender 1 so I reset the code and it hasn't came back on yet... I have noticed sometimes at an idle it's a little rough not bad but just a little... I am suspecting this is an AFM issue but my question is how do I fix it can I just tune out the AFM and or possibly look at the valve cover update and see if it needs that or am I looking at bigger issues, if so what all has to be done to completely fix this problem for good.
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