It was really simple, the alternator was charging at around 11.6 volt, whatever the revs. Couldn't be bothered to find the correct parts to repair so installed a Bosch exchange alternator and idle was back to normal.
Thanks guys for the replies!
Message Thread Iveco Daily 2.3 2000 - Starts OK, then idle rises - Fixed # - Job Gevers September 12, 2019, 7:57 pm
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