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my near original 1975 911S had the same/similar issue, I chased it for several years. Just converted her to twin Weber 40 IDA carbs. Best thing I have done in years. This beauty was basically not enjoyable to drive.
Best she has run in many many years
When new the CIS was unbeatable, after 50 years, not so much
my 1987 930 still has the CIS, runs great
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