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So I took my troublesome Jag to a transmission specialist to investigate the problems with holding onto gears at low speeds. He says the box is fine and the problems are caused by low fuel pressure. Took the car to my regular garage to check pipes etc and nothing is loose, leaking or misaligned. The car is absolutely fine tooling along at 70mph. The problem arises whenever I accelerate using more than a featherlight touch. The car either stalls or goes into limp mode. I've looked at online and there are all kinds of horror stories out there about pumps, injectors and fuel rails. I accept that it could be any of these things but I can't believe the car would run so well if something major was wrong.  Anybody had a similar experience? 

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So the diesel specialist couldn't find any problems with injectors or fuel pump. He did find milky diesel and debris in the fuel filter. Somewhat surprising as the filter has only just been changed. He has advised me to avoid supermarket diesel and see how it goes. The car is pulling well with no trips into limp mode at the moment. He also commented it was one of the sweetest X Type diesels he'd encountered. Not what I was expecting to hear. 

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There have been a lot of discussions on different forums about what grade off fuel to use, some owners add different additives to normal diesel.But i always try to fill up with Shell V Power Diesel and never had any problems so far. The electronics in the car adjust to the way the car is driven and diesels are meant to be driven,i have always been told not to always drive with the revs below 2000 revs and coming off a roundabout i put the foot down and it goes like a scalded cat, 

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Yep. I was trying to drive it hard before the limping and stalling. After that I had to drive like a pensioner in a Micra in order to keep it running. Now the low fuel pressure has been sorted I can be more enthusiastic with my driving. It's hard to exceed 2k revs in normal traffic though.  And the car is still gruff at lower speeds. It's still not 100%.

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