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Check for a vac leak where the primary throttle shaft slides into the throttle body on the linkage side of the carb. My sterling had a nasty leak there. There is a write up of mine stickied on 7club on how to fix that with an o-ring if you find a leak there.
I had the same problems with my carb when I got it. High idle, would stall when coming to a stop, under 1,800 RPM it would buck bad. Had to really know how to drive it to make it work right. I was at DGRR with the carb un-working lol For some reason too, my A/F screw has to be WAY WAY out but shes idling good now at about ~800RPM with 15in/vac at idle. Before it would do exactly what yours is doing, little to no vac under 1500RPM, but I used the third nipple from the left on the carb spacer.
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