Ford Escape V6 2004 loss if power when Throttle

Hello everyone

I do have a Ford escape 2004 V6 , petrol 

When I throttle rpm get up to 2500 try/min
And then a kiss if power and u hear something abnormal on the intake 

Work done : Catalyser emptied 
Throttle cleaned 
Intake removed and inspected for leakeage 
No leakage 
Injectors cleaned

Fuel pump pressure measured 3.5 to 4 bar 

Fuel filter changed 
Diagnostic done , no error 

Pls see video on the link below 

https://www.dropbox.com/s/z2ho6x5qtbwyeg...7.mp4?dl=0

Sorry The noise is coming from the belt tensioner and from the belt itself i will change them later 

Ur help will be really appreciated 

Regards 

Adel