K11 throttle problem

Hi all Paul here, this is my first post so hopefully in the right place.

Right here I go,
Off I went to buy a little run around 1997 micro 998 cc, was expecting to see the usual wear n tear but was pleasantly surprised on viewing this car with 92000 miles on the clock. Very clean and tight sending out all the right vibes. Car has been garages for last four years and driven once every 2 weeks. Started on the button and running every sweet at idle. Here's the prob ! Soon as I pressed the peddle a buzzing noise is heard under the dash erratic revs and engine light comes on? When released goes back to perfect idle? What could be wrong here.
Thanks in advance for any help and replies.
 
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