Valve/lifter problems.

[Jole]

If you start it, rev it out so it does that, then soon as it dies dissconnect something so it wont start and crank it, see if it cranks even or if valves are stuck, need to be quick tho as there likely sticking briefly.

It makes a noise when I start it straight after it's cut out that I can only describe as a lack of compression, sort of a whining if you know what I mean. I'll get a video..

But if a valve is sticking then it would have a lack of compression wouldn't it?

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Here's a video of starting after it's cut out.

to me this looks like a drop in fuel pressure can lead only to be cut off and that the pressure regulator