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I have a 1999 OX66 250HP #5cylinder is not firing properly. When you first start it, it will have fire for about 15 seconds and loses it. After it warms up, it will only fire for about 3 seconds and then stops and when you rev it up, it has intermediate spark. Can you give me some input on the problem? I have moved the spark plugs around and I have changed coils around and still #5 does the same thing.