Can someone here help me understand IF and HOW drilling carburetor throttle blades for an aggressive cam idle/T slot adjustment/optimization might also or not help in gear and out (park/neutral) idle balance on an automatic?
Background :
I have been having some issues of poor idle in gear and have been trying to tune (timing and carburetor) for a decent idle. I had initial success but now it no longer is working and the imbalance seems to have worsened. I now need like 1300 rpm out of gear to get 900 in gear. I have used two different carbs and getting ready to modify my 650 1450 throttle blades. My 750 doesn’t need the modification to maintain the correct idle T slot position. Bot both have poor in gear idle.
I have a wide band O2 so I can also see my a/f mix.