318 Engine stumble

I believe
That is totally a low-speed delivery problem, so I'm adding this to my previous post, #69 .But first disable the Vcan and repeat the test. I want to be sure your vacuum advance system isn't involved.If no difference is noted then let's continue;
E2) The low speed system consists of; 1) the fuel level,and 2) the transfers,and 3) the pilots,AKA the idle mixture screws,and 4) the Idle air bleeds, and 5) yje gaskets I guess,lol. One of these is gonna be the problem. And probably not #1.
So we are gonna need to separate the transfers from the idle mixture screws. To do that,it's easiest to prove the mixture screws are working first.
So;Idle it down to 650 or as low it will go. Make sure the secondaries are fully closed but not sticking.Put about 12 to 14 degrees of idle timing into it, then Idle it down to 600. If you can't get 600/650 there is a problem in the pilot system. So idle it down as far as it will go and let's continue. Pick a mixture screw and start cranking it in until the engine wants to stall then give her enough juice to keep her running. Then start screwing in the other one, the same way, and again add a bit back out. Now Firstly, they better both make a difference and they better both want to make the engine want to stall. Then shut the engine off then go count the turns of each screw and they better both be close to the same.If the screws end up within 1/2 turn of each other and the number is between two and three turns out, I would consider that normal. Now put them both back to 1.75 turns.
Ok but if one of them falls outside this range; We are gonna have to figure out if the mixture passage is at fault or if it's an air-bleed. So
Crank her up, and keep her running. Then from under the hood, we are gonna vacuum out the bleeds. So rev her up to 2200 and slam the choke closed. Just before she stalls open it back up and let the revs climb back up. Repeat two more times. Then see if she still runs like crap. If she's smooth now, congratulations, the engine sucked the dirt out of the bleeds.. But If no difference then it has to be in either the transfers or in the idle well.
So idle her up into the crap-zone and screw the mixture screws all the way in, one atta time. Do they both make about the same no-difference? It doesn't really matter to me cuz by this time I'm sure that the metering block has a problem. It's gonna have to come off for a more thorough inspection and cleaning.
The above assumes the PV is not leaking, through the diaphragm, and I touched on that in #69.
I think I got the bases covered,lol.