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I recommend getting a book on CIS not specific to Porsche. I bought the yellow Bosch paperback for $13.00
I use the voltage/duty cycle of my O2 sensor to adjust my mixture but just realize 1973 doesn't have one.
You sound lean to me and might suspect a vacuum leak. There is a mixture adjustment screw on the top of the CIS that often gets left open. I closed mine with a plug from our host and things worked much better.
ST
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