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1982 911 SC Pre-detonation

Engine

Vehicle Information: Model: 911 SC; Year: 1982; Body Type: Targa; Total Mileage: 300,000;

This car has a ton of miles (300,000) but great maintenance history. It runs great when cold and warming up, but after the temp is half way up it starts to ping in just one or two cylendars. As it gets hotter (never more than 3/4 up) it has serious pre-detonation at high throttle. I've set timing and am leaning on thinking that it may be running too lean when hot.

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