Aaalmost missed this thread...
In summary:
Mass air flow sensor "fault" (which may simply mean that it reads differently from what's expected)
Erratic idle..
Have you tried cleaning the throttle?
It did sort the issue once and for good in my case.
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`03 V70 Mk2 Auto 2.4 B5244 NA, 170Bhp, 295K miles
(Now parts donor)
'05 XC70 MK2 Geartronic, 2.5 B5254T2, 210bhp, 129k miles
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