Well even the IAW datalogger didn't show anything interesting - just that the revs drop off to 400rpm or so when the problem occurs. It does show that the temperature and everything else is well within what they should be, so that's positive, I guess.
Still have an odd 'hiccup' with the engine when it gets up to temperature. Also seems to happen when you rev and then close the throttle - the revs will often drop back to below idle.
Revs dropping:
Almost stalls after revving:
It's loads better than it was, but it's just not right. Probably time to let someone more knowledgeable than me take a look.
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