Squeaking engine and 2-3k high idle

Hi everyone,
Just done the cambelt on my 197, and since putting it back together its developed a 2-3k idle and a squeaking noise when 'idling'. (video in link, squeaking can be heard over the engine)
done the brake cleaner test around all of the intake and breathers, no change in revs.
Pulls fine and has as much power as before
Haven't done a throttle reset but it was a straight take on and off, didnt mess around with it, (if anyone knows how to do it that would be unbelievably helpful)
when on throttle the squeaking goes.
Has anyone got any ideas?

Thanks :smile: