Revving problem

I've got a BMW 7 Series and when i started it the other day it didnt start easily and when it was moving it just wasnt revving. I stopped and tried revving the engine a bit but the needle barley moved - what could be wrong
with the car.
Any help would be appreciated
Thanks
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1) Fuel flow problem due to clogged filter, bad pump or dodgy relay.
2) Filthy air filter or a bad connection in the intake plumbing.
3) If it's an E32 735i/730i or older the rotor arm could be seriously worn out, I've seen them almost totally in bits and the car still runs, just.
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