I got the same problem with mine(been doing it at least 2 years), does it intermittently usually when you think gap I can go or overtaking on motorway or just blasting away from traffic lights, I stood with bonnet up and got someone to rev the engine occasionally the engine twisted so much it completely crushes the big air flow/throttle pipe
 
An old post, but thought I would add that I had the same loss of power when accelerating hard at 5000 rpm in my 2003yr freelander sport v6, the engine power would drop suddenly and recover when backing off to part throttle. Changed the in tank fuel pump/filter module and now all good all the way to 6500 rpm! Would have just changed just the filter but the whole pump/filter/sender unit was only £37! From ebay - https://ebay.us/R6tAbN
 

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