We found the code coming up with the airflow meters so first thing we did was clean them with contact cleaner.
Though that might have fixed the problem but its still doing it.
If anyone has a pair of them we could borrow to confirm that they are the problem.
When idling they read on the power fc hand controller around the 1000mV and when it started playing up dropped to 500mV.
I'll swing past on my way home today and grab them if possible!