waving revs on cold engine

Hi guys, sorry for my english but i need to have quick answer. So my problem is, when i start car after few hours (after night in garage) revs should be between 1,100rpm to 1,200rpm but in my situtaion is about 800 and jump into 1000 and again t 700-800... i have to turn it off and start the car again and after this is all normal?? any advice??
 

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