mine does it too. i got Berk HFCs and Stillen G3.
It did it when i had my AEM intake too but not as much as with the Stillen.
I think it's got something to do with the CCV pipe barb on the Stillen tubes being narrower than the stock one. The AEM barbs are a little larger in diameter.
When i had just the HFCs, i dont think i can recall it happening.
i have done several versions of the throttle body idle relearn procedure, and the frequency of the idle dip has reduced a bit. The motor does seem harder to feather when reversing for example - ie it feels like it's easier to stall.
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