Recoverd in by Rac erratic revs
No fault codes present

It initial revs high at roughly 1900 rpm then settles to 1400rpm

Once revved idle is the erratic bouncing from 9-1300rpm

I've found that If aircon is switched on it idles nicely at 800 ish rpm

Initial thoughts where vac leak fuel trims show to be ok
Short - 0 and long 8.6 when its revving erratically

Map sensor seems ok intake 39kpa when idling ok with aircon jumps about from 40-52 when revving erratically

Coolant temp is reading ok
Throttle position. 4%

I've removed cleaned throttle body on the off chance
And still the same

Went round intake manifold with Brake cleaner to check revs don't change
Removed oil cap and still same

O2 obviously erratic too when engine is erratic
When aircon pressed an revs stabilise
Sensor 1 reads 742.2Mv and sensor 2 reads 232.4 mv for a short period

Then rear shoots up to 722.6 mv and stays reading that for a short period before going lean and reading 195.4mv

Could this be fuel related?
Anyone had anything similar?