Hi,
I have also faced the same problem in my VXR 2018 - 120K Driven, went to several mechanics, one said the problem of the accelerator pedal, one said the ECU has gone wrong, etc etc, I was not satisfied, then I came across an electrician and straight away He said to change the Spark plugs to Original NGK Plugs, I was using Denso at that time. I changed the plugs to NGK and the Problem was immediately solved.