Light knock when first starting in the morning

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Warriorpluto

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I have an 07 Yukon denAli and it has 113k miles. It has light knock at idle for the first ten minutes of driving then it goes away. Is it normal? I don't have the afm valley cover.
 

Buzzcut

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Piston slap is my guess and it happens on high mile engines of this type.
 
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Warriorpluto

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Oh ok I guess I shouldn't worry too much about it. Thanks guys. I'll try not to mod this truck. I do want atleast a cold air intake. Which one is worth getting?
 

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