Hi Guy i have found the air flow sensor i think i can unplug it without taking the cover off but having had a quick look at the cover how the hell does it come off? My last car a peugeot 206 had a cover with 2 bolts right in front of me holding it on but cant see anything on the micra..
When i had similar symptoms on the 206 a peugeot garage mechanic told me unplug the air sensor ( map sensor ) and take it for a drive and if the car performs better it's more than likely the fault which in this case turned out correct i replaced the air meter and it was all sorted.
I'm thinking of doing the same test on the micra today to see if the flat spot and idle seem better...
