Lack of revs. 160VVC

[Hangman3]

Hi,
I have a 160VVC that runs well untill I try to take it over 5.5 revs. After that it just caughs & splutters.
Any help please would be great.

[JOHNDQ]

Sounds like a fault in the VVC, the ecu lowers the rpm for safety reasons trouble is could be the hydraulic unit, a sensor, one of the hubs at fault your going to need a code read first try to narrow it down. Could be a very expensive fault if it is a VVC problem