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Was the distributor (ignition not fuel, new or rebuilt? I once installed a Pertronix ignitor for the 1977 911 2.7 CIS and it ran weirdly (popping and misfired at certain rpms) when warmed. Turned out to be a badly rusted advance weights inside the distributor. A new Bosch distributor ($400 from Florida parts place) cured the problem.
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