Here's what my problem was:


https://passionford.com/forum/viewtopic.php?p=2042048

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Karl's reply:

Hi Charlie,

It will almost certainly be an air leak under boost.

Things to check:

Dump valve (if fitted) check diaphragm isn't split and that it seals
correctly.

All boost hoses are in perfect order with no splits or tears and that the
jubilees are tight

Inlet manifold gasket to head

Plenum cover gasket to head

Throttle body to inlet manifold gasket

Injector o rings to inlet manifold

Any of the small bore pipes coming off the plenum cover or even a leak going
to your boost gauge!!

I'll put money on it that its one of the above!!!

Let me know,

Cheers,

Karl