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Message: <blockquote data-quote="wingzee" data-source="post: 680263" data-attributes="member: 22730">Do a computer diagnostic & see what fault codes that were generated. Root cause might be determined by looking at the codes.I used to have a constant misfiring on a particular cylinder. And still happens after replacement of new coil. Once error cleared, misfiring will cease but will come back later on. Only upon replacement of second new coil that it solves the problem. This meant that even new coil might not be performing up to its optimum.What's your milleage by the way?Learnt this from a fellow forummer, always try solving the issue via the cheapest option first.</blockquote>