My 2004 XJ8 (not supercharged) "flutters" a bit going uphill at 30 to 40 mph. Some flickering of the tach and a slight

Hello my name is ***** ***** I will do all I can to help you with your Jaguar. Is the check engine light on ? A hesitation or miss under load is most likely going to be a failing ignition coil. In my experience, with 128K miles they are the most likely cause for this condition.

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It is odd that it is misfiring and not setting any codes (check engine light coming on). An advanced scanner may reveal pending codes for one or more cylinders misfiring. If it can be identified as a misfire on one or more cylinders, I would recommend biting the bullet and replacing all the coils and plugs at once if you intend on keeping the vehicle. The 2004 XJ is one of my favorites (I worked at a Jag dealer for 10 years). I would definitely first confirm that we do have one or more cylinders misfiring. It won't be an inexpensive repair, but it will cost you more in the long run it will be more expensive to replace them individually. In my experience they have reached the end of useful life.

Correction - it will likely be an expensive repair.

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Thank you for the rating and choosing JustAnswer. Should you have any additional questions I will do all I can to assist. Good luck with the Jag 1