Right I have an update. I went to my friends and we were going to go to the garage, but on the way it fixed itself :S. Don't know how but it just stopped which makes me think it was a sticking valve. Now I get misfires every now and then, but I am running on four cylinders again. The garage said sticking valves are quite common on micras, so it could be the same for you mrogers, but I hope it isn't. To get it fixed they said it'll cost 600 :|, since they have to take the whole engine apart or something. Anyway, for now they are going to try and put some 'forte' in and see if that unsticks it. I can't see it being a big stick since it just came unstuck this morning...
I was just wondering if anybody knew if it could be anything else. I'm clutching at straws because I really don't want to spend that much on a micra... Speaking of clutch, I need one of those soon too hahaha.