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If a 4 cylinder engine only runs on 3 cylinders, for example a plug/coil is knackered, is there any long term damage and will the cat be useless since I assume excess fuel will have got into the exhaust.
What, it's run continuously on three cylinders for 300 miles (i.e. not just when starting up)? If so, it doesn't sound good -- the fuel may well have poisoned the cat