Members who reacted to message #6

Dear Sifu's and frens ,

Yesterday i realised my car cant pass 5k rpm.
After 5k feels like tersumbat or loss of power . any idea why ?

Additional Informations :

Last service - 2K km ago . still got 5k to run
Which gear - So far starting from 3rd gear.
Just serviced aircond few days back .
Air filter cleaned last week .
Redline starts at 6.5 k .

Any idea why is this happening ? help is much appreciated. :D
thx