Question about 2000 Ford Focus

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I have a 2005 Ford Focus ZX4 ST. I have less than 73k miles on it. Have never had any issues with it. Perform all the regular maintenance at required intervals. About a month ago the check engine light came on. Every so often, at highway speeds, the check engine light would flash. Checked the codes and had misfire on cylinder 1 and 4. Replaced the plugs with no change. Actually got worse. Replaced the coils. Engine runs better at low speeds. But the check engine light comes on once and awhile and clears a day or so later. Misfire still occurs at highway speeds, above 60mph. Sometimes I can drive for 2 hours at highway speed and no misfires. Other times the misfires occur every 10-15 minutes. Misfire usually lasts about 2 minutes before clearing. Once the misfire starts it doesn't matter how fast or slow I am going. It will last about 2 minutes before it goes away. Any assistance would be appreciated.

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I would start with plug wires rubbing on something and created a short.and is not compleatly worn through. a cheep place to start. good luck with it.

Posted on Mar 25, 2011

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