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I was going to say that the jets have no effect on idle, cause the blades should be closed...but then you said the idle screws have no effect.
where's the throttle setting? timing?
be sure the throttle blades are not too far open at idle, or the idle screws will never have an effect
 Exactly what I would have said. If you don't have enough timing at idle then you end up compensating by opening the throttle farther and then fuel starts to flow from the boosters and it's all downhill from there. 
In theory, there is no difference between theory and practice. In practice, there is.
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