i have a 89 v12 xjs that will run until it warms up and when the throttle is depressed rapidly while driving the engine will quit. I can restart it after 5 to 10 minutes and it will then continue to run. I have replaced the fuel filter so this is not the problem.
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I see that 147 people have stopped by and have not been able to help. Unfortunately I can't be of help either. The problem is that you have posted in the XX-400 forum which is for the 2001 to 2009 X-type.
You will get an answer to your problem if you repost in the XJ12 forum. Click on the link below to that forum. Thse folks are very knowledgeable on the V-12.

https://www.jaguarforums.com/forum/x...s-i-ii-iii-16/