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My symptom is not a miss at high speed or any speed, its a stumble or hesitation that persists and prevents much throttle input until about 4000 rpm. You have to nurse it along. Not consistently, comes and goes. Once it clears, pulls hard with no missing evident. I’m thinking it may be that the vacuum advance is not working. The vacuum advance port holds vacuum but fails to move the rotor. I will look at this more closely when the distributor is out. Also the green wire that carries the trigger signal from the distributor to the CDI unit. My tach is behaving normally.
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