1.3 Endura-E lacking power at higher revs

Ive got a Mk4 fiesta, with the 1.3 Endura-E engine and just recently its been lacking power at higher revs. Anything above 3800rpm and i can feel a real
dip in power. It doesnt seem to do it when i first run the car in the morning and after work when its been stood a while. Any suggestions people?
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