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Reply to "spark timing"

i'm not there yet...went today to the harbor and had again that problem : car is pulling like a torque monster up till 4000 rpm and beyond that hesitation, no misfires, just running lousy.To rich when the secondarys come in play ?? ( Edelbrock )as i see very dark exhaust tips and sure no oil consumption.
I had changed the secondary jets to a # larger but could have been mislead as i had at that time a malfunctioning distributor...

Can it run so messy beyond 4000 rpm when to rich on secondarys ?
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