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1974 911 Engine cuts out while driving

Engine

Vehicle Information: Model: 911; Year: 1974; Body Type: Coupe; Total Mileage: 68000;

My 74 911 with a 77 2.7 engine cuts out or bucks while driving at highway speeds intermittantly, I notice the tach needle seems to drop off suddenly as if it were ignition. Any ideas what to look for before I get stuck some place?

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