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Idle problem 140-160 1969

Ok, the Petronix is in and the carbs leaned out. She ran better than ever! BUT...dieseling upon switching off the engine. I believe it's low octane high test (all I ever use is high test conventional real gas, never gas with ethanol). I have also used a "104 Octane Boost" to stop the pre-ignition in the past. Just haven't had a chance to top off the tank and add it yet. I expect the problem to go away when I add it. Tbc...






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