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my 318i suffers a loss of power when the revs reach 4000 and over.I have checked all pipes for leaks,fitted new plugs and leads,have also changed rotor arm and cap could it be crank shaft sensor?
 
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Have you checked if its still the same with the MAF disconnected?
 

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It will only run rich with no MAF sensor connected. It will be OK and will give you an expensive power increase.

*Have you tried a compression test?
 

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Could be fuel filter if it has 1? or airfilter may need replacing. Both can restrict high revs if they haven't been changed for a while.
 
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