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Annoying Missfire

Hi guys! I hope some one can help me with this. I was driving to work at a very leisurely pace and started getting an irregular missfire. It would clear then comeback every few mins. After a while it was constantly running on 5 cylinders, I removed the coilpack on the dodgy cylinder and replaced it with one of the others and it still missfired. the porcelin round the sparkplugs electrode was broken but the electrodes were perfect, so i replaced it. now when i drive it the missfire is there until i hit 3000 revs then it clears and it runs smoothly. PLEASE HELP ME. ITS DRIVING ME NUTS! :headvswal :(

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    Hi mate.

     

    Have you had a look at the PTU connectors they might be corroded

     

    Eddie

     

    Hi Eddie, Yes ive checked the connectors and ive put my spare PTU on the car just incase but its still the same :(

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