Well it only knocked once drove it back to the house parked it for the night then started it back up in the morning and it was fine hasn't knocked since but now around 5k rpm a complete power loss happens to the car. I was reading this article and it said that "when accelerating the engine knocks (/pinks) and this is being detected by the engine knock sensor. In order to protect the engine the ECU retards the timing until no more knocking is detected. If the ECU is still detecting knocking at this point, it may go one step further and close the turbo VSV, to limit the boost to a lower, safer, value."

Also "The only cure is to retard the spark timing at the distributor: In my case, it had to be moved to 5 degrees BTDC, and the car will run 95 Octane unleaded, at the expense of a little top end power and affect cold engine performance."

In that peice I was reading it says that you can feel it at around 5k rpm and thats exactly when you feel the car just drop off in power