Gap changes timing but you change the timing to the set point by rotating the distributor. So in effect one cancels the other. I will say this one more time. IT TAKES AIR to make an engine run. If you cannot idle it down, it is getting air (and fuel) from someplace. You can say you and I disagree all you want but engines don't work that way.
I'm sorry your panties are in a big 'ol wad