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Make sure you have the correct heat range plugs fitted. Even the plug manufacturer lists can be reproduced wrongly! The recommended plugs were listed on the front slam panel originally but the label might be gone. These engines don't like the multi electrode design but prefer the simple single electrode type. I prefer Bosch or NGK=BCP6E/BCP6ES You may have an inlet manifold/associated pipework air leak = the car runs fine on a rich mixture but as it leans off with increased engine temp the misfire starts.
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