Just wanted to say i would check for a vac leak if you can get it to idle above 1400 rpms or you can make the timing hot and it will go.. my car was doing that not to recently ago and it had a vac leak on the intake.. One of the plugs I had in it came up plugged..
I myself have found a few different issues with the carbs. The one thing I have found other then what everyone else has already posted is this past year in particular is that the gas itself is not rich enough to sustain normal running even at idle. I would #1 make sure you have 92 or higher gas.  What you might have to do is actually upgrade the main jet in your carb. If all these others (besides turning your dist. & making it run hot WHICH IS A NO NO! UNLESS you want to cook your engine!!) then I would look to upgrading your main jet. There a cheap and easy to fix.
You don't need over 87octane gas to run a vw.... I constantly get regular unleaded.. If I run premium it doesn't make the car run any better..
We build VW Engines for a living. I have found through trial and error that the high alcohol levels in the gas today are much different then the gas 40-50 years ago. Here in PA where we live we have started to have to use our 92 gas in order to make our engines run correctly. In the past year they have added more alcohol to our gas. It was posted as for a reference if nothing else works it's better to try something then nothing at all. In your area maybe they haven't changed the gas concentration as much as they have already started to here. But if you run into the same problem maybe you will find yourself using my information. This was not posted to start a rumble this was posted to help someone in need with information that we have found to help fix our problems we have had ourselves.
i have been fighting the same problem with my 34 pict 3 , it is a almost new carb, i rebuilt it but it did not change anything, i am running the good grade fuel, i just pulled the carb off and the butterfly hole is on the same side of the venturia, i guess i will see if the holes are stopped up by running a piece of wire thru it, i have checked for vacuum leaks and found none,
o.k. i have checked the holes in the side and one was stopped up, i got it open and it will idle now but is erratic, i will test drive it for a few miles ( when it warms up above 30 lol ) and see how it does, it might startin out some?
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