poor fuel

Hi everyone.
I own a Nissan micra k11 s reg.
Got a problem coming to a stop the car revs up then drops down.
ANYONE can advise me please
 
When I worked at vw the golfs were prone for this. If its not vacuum pipe have a look at the throttle might have some **** in it and may need cleaning.

Has it only just started after you changed filter?
 
Which pipes I should be looking for?
It's wired because when I drive the car and take it out of gear the revs drop stright away but when I slow down in gear the Rev go up then back down.tjats what I think
 
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