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Hi Guys can any one help?

Td6 l322 range rover it's lacking power/limp mode when cold had no fault codes so went to maf disconnect it. runs like a dream so swapped it out but same with new one, unplug it runs fine but I now have fault for low side rail pressure. Smoked it for boost leaks checked live data fuel pressure seems good but maf is reading 660 but asking for 440. Could this be a faulty maf or is there something I'm overlooking has new fuel filter but made no difference.
I now have code p1260 I've replace fuel filter afm battery and the low pressure external pump but still the same ? any clues live data shows fuel pressure fine high and low side I'm at a loss on this as I hate doing the parts cannon

any help appreciated

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