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Best Spark Plugs for 1972 911T

Electrical

Model: 911 T, Year:1972, Mileage:105000, Type of use:Street use only
Getting increasing hesitation around 3000 RPMs. Wondering if it might be a spark plug problem. Last changed the plugs in 1994, around 35,000 miles ago. What plugs should I use these days? What gap should they have? I have mechanical fuel injection.Normally use 89 octane fuel.

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