If both of your idle mixture screws when turned either way with the motor out of gear will effect the idle which is as it should be, then I say You have a vacuum leak more likely then not making for your issue.
When doing this check out if you find that one mixture screw needs to be adjusted way different then the other to attain the best idle then you have either found the side of the carb with the issue, or the side of the intake that gets fed from that side of the carb.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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