Hi im having a few issues with my audi A7 bitdi 2015 with around 124k mileage. I had an issue 2 weeks ago with the engine running rough and misfiring. Scanned the car for any codes and was showing p0305 indicating a misfire in cylinder 5. Had the injector removed and tested and it needed replacing. Had a new injector installed and coded. Car was running fine for a few days however, it is running rough again and just feels sluggish overall. I've scanned the car but no error codes are coming up. Car is not misfiring. When im driving on the motorway, the car no longer feels smooth and doesnt pick up well unless I press the throttle very hard. Any suggestions on what could be the issue?  

Edited September 21, 2025Sep 21 by Naeem

Hi I've attached the injector data and also an image of what injector 5 looked like when it was removed. Could it possibly be that the injector seals for the other injectors also need replacing and might be causing my issues?

Edited September 22, 2025Sep 22 by Naeem