Help please

Hi
Im new to the whole forum thing and i hope im posting in the right place here.
I have a nissan micra 1.0S 0n an X plate. On starting it ticks over fine but when i try to rev it up it kangaroos, meaning it revs a little then drops off then revs then drops off; constant vroom vroom vroom. I've changed the mass airflow meter this morning and it hasnt fixed it. Any ideas please!!!!!!
 
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