RPM Problem.. HELPPPPP.. (with VIDEO..)

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Its been a week now since i got this new 2... And i just recently discovered this, What seems to be a problem.. If i hold the Car at exactly 2000rpm.. It will drop to 1800rpm.. Go back to 2000 then drop again.. And the same if i hold it at about 2500rpm.. it will drop to 1800 and then go from 2000 to 1800 repeatadly.. :confused: I have uploaded a Video to show what it is doing.. And I am hoping that someone can ched some light on this issue i have... ALSO.. the radiator fan is always