Perhaps you could explain further? The noise could simply be an air intake hose come adrift, but I'm not sure what you mean that the car is 'dying'? Is the engine making metallic clattering noises? Is it down on power? The Micra only really suffers from two major mechanical problems 1) Timing chain rattle - which is just like it sounds 2) Throttle body problems which give a poor tickover, stalling etc.
John
April 2008