528 Hemi help

Air bleeds add air to emulsify the idle mixture. I suspect you may need to change the IFR to reduce the amount of fuel available in the idle circuit. This should allow you to choke down on the primary and secondary throttle butterfly opening to get closer to the optimum .020 to .040 transfer slot reveal. If air bleeds are too large then the idle circuit will respond poorly and that is why you get stumble. The balance is the correct IFR (Idle feed restriction) and the correct Idle bleed size to allow for good off throttle response and light throttle running. Even off idle the idle circuit does contribute to fuel delivery on cruise conditions. So it needs to be correct. Keep in mind that IFR changes are more severe than air bleed. So just reduce your IFR by small increments.