2006 Yukon Denali Misfiring?

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loveav8

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What's up!? I'm hoping someone here can shed some light, or have an idea as to what the heck is going on with my '06 Yukon.

I first noticed this issue a couple months ago -- after a cold start. It kinda does this thing that I like to describe as stuttering, but it still runs well once it gets going. The check engine light is coming on now too. I took it to get an oil change, and the guy read the code saying it's misfiring. I spoke to my brother, and he thinks it might be the spark plugs? I have no clue where to begin. Any ideas?

Perfect timing too, I was hoping to sell it soon. Even before this issue. smh.
 

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