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First you have to eliminate any chance of a vacuum leak in the front cylinder: head gasket, valve guide, intake nipple, etc.What manifold are you using, and have you done anything to it?
What size of a vent are you using for the Thunder Jet? By changing it's size you can adjust when it starts to take effect. I can't remember which way to adjust the vent size to go higher or lower in the RPM range when the T-Jet kicks in. Also, what RPM's were you at when it started to go lean?