:L
Don't worry, you'll get it fixed eventually. What do you mean by maf test sorry? Did you remove it and try it? If you removed it and its the same then it could be maf to say that its not detecting it in the first place. Or it could mean that the problem is somewhere else for it is staying the same but if maf is faulty, i have found disconnecting it usually makes it run better anyway.
Does it do same when cold?
Out of box thinking is fuel pump but usually this is not the case as far as I am aware with corsas anyway.
Can you borrow a maf for a 1.6 off anyone or take a trip to scrappers to get a maf and a egr valve?
Have you checked the throttle body functions fine/ It may be worth taking the top off it and inspecting it, if its black/gunky then clean it with carb cleaner, if it doesn't fix it - all it will do is improve fuel efficiency in the long run. Worth doing while you are in the bay.