Relationship between idle jets and idle mix screws Options

[era vulgaris]

How much can one compensate for the other?
For example, with larger jets and idle screws further in, could you tune a set of carbs identically to another set of the same carbs that had smaller jets with the mix screw further out?

I want to experiment with going a little leaner at idle and seeing how my engine likes it. I'm trying to decide if I should order a smaller set of idle jets or if I can achieve the same result by just turning the screws in further. Basically, what is the difference? Don't they achieve the same ends? Obviously there's a limit on the rich side because there's only so much fuel a jet will allow to flow. But if you're trying to lean it out, what's the difference between going to a smaller jet or just turning in the screw?

[era vulgaris]

It idles around 1100.
Yeah I normally roll up to a stop in neutral. I don't hold the clutch pedal down unless I'm shifting.
Like I said, it's only once every so often. But it's a slow dying when it happens.
It idles fine when I get to the stop, then down 100rpm, hangs out there for a few seconds, then down another 100 rpm, hangs there for a few seconds, etc until it starts struggling to stay alive. Then it's the lightest touch on the gas pedal and it comes back. Sometimes that's all it takes and it's fine again. But if it's like the 3rd time or more that I've driven the car that day, it usually doesn't come back to idle, and that's when I have to gently hold the gas pedal with my heel. But then maybe the next stoplight it's totally fine again. It's not a consistent or constant problem at all. Just happens enough to be annoying.

[rfinegan]

It idles around 1100.
Yeah I normally roll up to a stop in neutral. I don't hold the clutch pedal down unless I'm shifting.
Like I said, it's only once every so often. But it's a slow dying when it happens.
It idles fine when I get to the stop, then down 100rpm, hangs out there for a few seconds, then down another 100 rpm, hangs there for a few seconds, etc until it starts struggling to stay alive. Then it's the lightest touch on the gas pedal and it comes back. Sometimes that's all it takes and it's fine again. But if it's like the 3rd time or more that I've driven the car that day, it usually doesn't come back to idle, and that's when I have to gently hold the gas pedal with my heel. But then maybe the next stoplight it's totally fine again. It's not a consistent or constant problem at all. Just happens enough to be annoying.

IT sounds to me like 1100 rpm is off the idle circuit and into the transitions. try to set the mixtures at a slower speed (less throttle plate opening)Last steps this set the idle speed

-Robert