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The other day at about 3500rpms 65ish started to break up. Thought it was fuel related. Higher rpms it was good, low end pickup and shifting was good. Once past 3500 sputter it was good.
That's an unusual symptom in my experience. How many miles on the motor? Have you made an changes to the carbs recently?
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I hope its not electrical again.
What electrical problems have you had?
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I guess under load its dumping more fuel but IMHO 3000 rpm is always 3000 rpm regardless of load.
Well, you have to open the throttle further to maintain the same RPM when the motor is under load. That, in turn, reduces manifold vacuum, increases combustion pressure, increases fuel draw from the float bowls and dampens the spark. The latter is the reason weaknesses in the ignition system/plugs often show up only under load. That 3500 RPM symptom is very odd though. I'm just not sure what to think about that, although instinct tells me its electrical. Now that you've replaced the plugs, you're entering more expensive territory in terms of trial and error diagnosis. My recommendation would be to take it somewhere they can put it on an engine analyzer. I'll be very interested to know what's causing this, once you get it sorted out.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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