lean at 4k under light load

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Why do I feel that there is some sort of resonance with the intake and header about in the place Ray is talking about?  When I get a chance  I will download a pic of my fuel map,   Ever since I put in the header there is a bubble about 4K and 2/3 load where it needs more fuel.  Like twice the amount of fuel. 


Someone with way more experience than me needs to chime in here. 

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