persistent cylinder misfire, 2004 Jaguar X-Type 3.0 liter. At 81,000 miles, my 2004 X-Type 3 liter V6 developed a rough idle and CEL. The code was cylinder 3. As long as I was pulling the intake manifold (necessary to reach the back cylinders), I replaced all the coils and plugs. Things were fine for about 10 miles, then same symptoms except X8lMW.