Hello, Please bear with me as I know very little about cars. I have an old 1.4 Nissan Almera (N reg). The problem is that the engine revs too much whist in gear (sounds like its in neutral) and seems to restrict power. When I put my foot down the engine revs but I don't seem to be getting any performance out of it, also when I got home last night there was an awful burning smell. Please advise.