Going lean than rich when chopping the throttle

WesG

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When I chop the throttle after running hard, my apex flashes lean (14-15), than it goes rich 10-10.5. I'm assuming the split second of lean condition is the last bit of air pressure using up the fuel. any idea's on the rich loading? It runs 12.7-13 at an idle. It's a boondocker gt25 kit on an 06.
 
Mine will show lean to when the throttle is chopped its a normal condition to have. Now sure what you mean by the rich loading?
 
A/F ratios

I beleive I am rich at an idle even though I am showing 12.7-13. Think this is causing it to load up after I get out of the throttle. Takes a couple seconds to clean out and come back to 12.7-13. Where does everyone set there idle A/F at? This is a side-mount boondocker setup. The O2 sensor is 5-6 inches from the turbo outlet side. Thanks for the reply.

Wes
 
I run my probe right infront of the factory muffler. On my EFI I see 12.3 warming up and usually 12.8-13.0 idle.
 


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