Larger idle fuel feed tube orifices might help an off idle lean stumble. Once off idle, the main metering circuits come into play. The power piston spring, APT, and metering/jetting take effect.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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