Throttle shaft too tight in base, throttle arm too close to cast iron base, or accelerator pump cup swollen.
The throttle shaft needs to have .003" or more clearance to the bore, or it will stick when hot.
The throttle arm on the center carb (and the ends), needs to be at least 1/16" away from the cast iron. Iff too little clearance, when hot, the lever rubs on the cast iron base.
If the carbs were rebuilt with black (pre-ethanol) accelerator pump cups, that may be the problem.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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