I had the same issue,
Got a code took it to the dealer they said it was the camshaft sync error.
£3k repair later and its much better. It did do the surge once the day i got it back but never again after that. Car drives like new now. Odd start up gargle but once its on it does everything as it should.
No dealer or jndy was able to definitively say what causes the surge but now i take videos of every start up to try abd compile a trend if what it is.
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