I had a TVR once that sprayed water onto the distributor from a leaky radiator seam. I blamed the misfire on some cheap petrol bought previously. The leak wasn't apparent with the engine stopped.
I think that one of the original Crypton analyser units would solve this- they measured all sorts of engine parameters and could even diagnose single cylinder problems.
Without breathing too deeply, when in limp mode, does the exhaust smell of unburnt fuel? For a fuel delivery problem- do you have any transparent pipe, or a clear filter in the fuel line?
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