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Hey I have a 2010 yukon denali, and I am having a missfire problem that I can't find a source.  The missfire is always below 2000rpm and only after its been driven for a little bit.  I am not getting check engine light.  The misfire is getting worse and I dont know what to do.  Any help would be great.  

 

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If it was me I would do easy first, like fuel system cleaner. 

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I have tried that as well as cleaning the throttlebody.  I replaced plugs wires and coil packs. I dont have a check engine light so I am stumped.

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