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If you checked the new rpm transducer in another car and it worked well then it’s not your issue! And I would definitely not delete fuel shutoff on overrun these mfi cars can have some huge 12ga backfires. The 70 - 73 cars used the same system. Your answer probably lies within the wiring diagram.
If your wiring is good (cdi box, coil, transducer, microswitch, etc. I would try a different cdi box.
The shut-off solenoid gets power from the microswitch. The microswitch gets power from the transducer. The transducer determines WHEN to send power to the microswitch based off RPM. The transducer gets its sense of RPM from terminal C of the cdi box.
It sounds like you either have a wiring issue (maybe crossed wires) or the transducer is receiving an incorrect “rpm” signal.
The cdi box gets its "rpm” signal straight from the points.
Does your tach work well?
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it's not leaking....it's just marking it's territory
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