Last weekend my car suffered a power cut out and reduced power whilst gently picking up speed on a dual carriageway. At the time it flagged a fault code, but I didn't think to take a note, I just reset it. As the clutch was nearing it's end we assumed it was the flywheel having a wobble, so it was pulled apart on the drive and the clutch and flywheel were changed. As it was on the drive being worked on, the following was done: New engine oil and filter. New gearbox oil. Front and rear diffs fresh oil. Haldex oil and filter changed. Brake fluid changed. Air filter was checked and found to be like new. On top of the above, since buying it at Easter it has had: New cambelt and water pump. New fuel filter. Carbon engine clean. New Cam follower. New Iridium spark plugs. New coilpacks. New DV and DV+ (fitted tonight). As I fitted the DV+ tonight I took it for a drive and it was driving fine until it reached 4.5-5k rpm, and there was a significant drop in power and a jolt. Naturally I let off the throttle at this point and change up a gear. This has happened in 2nd and 3rd gears so I think it is RPM related. I have captured a video in 2nd gear to try and demonstrate the problem. Whilst I do have a Bluefin remap for the car, it is not installed right now as I'm still bedding in the clutch, so the car is in standard form. I'm baffled as to why it is doing it and would appreciate any advice on what to look at. I have 'Torque' app installed so can do limited logs etc.