OK, so if I'm reading & understanding correctly:
Happens at a light decelleration, butterflies partially/mostly closed.
At that point, should have a pretty high vacuum reading, not pulling much fuel, no load.
Maybe it's a bit too lean @ cruise, or maybe advance weights are sticking (not sure what ignition you have).
When you say "missing", does it feel like chugging, or dropping the occasional spark, or like a burble from the exhaust ?
Happens when I pull back very slightly on the accelerator due to going down a very slight downgrade. I just pull back ever so slight on the pedal. I'm only pulling back about 5-10%.
Seems like it's loosing spark. The first time it did it I thought I was running out of gas for a second.
