Harms Rebuilt '71 Thermoquad - Wondering Idle, Stalls when Put in Gear

Bewy said

You have two different brands of carbs doing the same thing: varying idle speed.

Something not right with only 11" of vac. It is low, for whatever reason. It is probably causing havoc with the PCV valve. I would disconnect the PCV hose at the carb, & plug the carb port. See if you can then set the idle.

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If at a Manifold port the vacuum is 11" then you have one of 2 things. A problem or a not stock build. If it's stock and in somewhat good mechanical condition I would expect to see a minimum of 15" and I'm on the low side.... Figure that out and your carburetor may not be the issue.....

JW