I think the problem as you said above is it could be many different things, i have a similar problem with resitation, and then revs being "held" without my foot on the loud pedal, and once warmed up would rev on its on.

First was told to take off, clean etc or replace ICV, then told maybe something simple like throttle cable jamming. (Depends on which phase) and lastly someone pointed out possible air leak, which it was from one of the rubber pipes going to the inlet which had split, replaced and it ran like new, but cost over £220 to find out and go through the list.

Also forgot to mention another "possible" was the power steering pump plug, blue one under the inlet manifold iirc, disconnect it, start the car and see. (cheapest option to replace the plug/sensor at under a tenner)

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Ex-Black 6 - Speed has never killed anyone, suddenly becoming stationary... That's what gets you.

As above it could be quite a few things.

One thing i'll add to the list is the fuel system, it sounds similar in the video to mine when I used to suffer fuel starvation albeit not quite as bad.
It was only noticable at first if I was very low on petrol then It gradually got to the point of any less than quarter of a tank would do it so I changed the pump and it cured it.

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Ryan