carter avs 4612sa help
sorry guys got my answer just had to dig a little
https://www.hotrod.com/articles/mopp-0305-carter-avs-carburetor-install/
How to Rebuild the Carter AVS Carb
Some later AVS carbs came with a hot-idle compensator valve. A crudeemissions device, the compensator opens a passage to the manifold vacuumvia a bimetallic thermostatic strip. When it opens, a significant vacuumleak is created in the carb.