I noticed by chance the fault occurs even when I was in neutral and rolling down a hill. It was speed related rather than load related.
So I disconnected the abs pump and low and behold the fault went away. Car drives perfect. So I connected back up and did a parameter check, the brake pressure sensor was jumping from 0 to 650 bar which Is well outside the maximum limit. This must be altering the engine timing and map thinking the car is braking. Next step is an abs pump or repair to brake pressure sensor.
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