HI All new member here, location Hampshire ,Berkshire Surrey boarder. My car Discovery 2 td5

Need help

https://www.samaritans.org/

I have had injector seals changed twice new fuel pump fuel filter and pressure valve changed because of the car cutting out, this has cured this but now no power, flat as a heghog crossing the M1.
If I disconnect the Mass air flow sensor power returns but gear changing (auto gearbox) no good dwells too long sometime
Any help

Welcome to the forum.

Yer be betterer to ask disco questions int disco section. This one is only for introductions.