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Thanks Bob. I’d say if backing it out stops an off idle stumble on a stock motor, then it’s only because they run leaner on today’s fuel. Which is cured by a slight increase in the size of the IFR. Or there is accelerator pump issues. Assuming ignition timing is sufficient.
When you pull the booster, 2 tubes are pressed in from underneath. The smallness is necked down to form the IFR. Typically between .030 and .039 in a Stock AVS
I just responded to your pm. As said above it is for idle bypass air. Factory calibration is usually fine except in the case of a longer duration cam. In that case, I like to see the idle feed restrictors enlarged slightly also to bring your mixture screws back into range.
No, no Wuhan or any other excuses here. Your stuff is all shined up and all the plating has been done for a few weeks. It will be on the bench for assembly next week. I do apologize.