I have this issue that started last night not sure what it is but when my car is started but in park the idle goes and down and my car makes a noise and seems like somebody is reving it up. does anybody know what this is from

 

More info needed. Don't understand, is the idle low or high? What kind of noise is it making? (clunk, squeak, bang) What part of the car is it coming from?

 

its a vroom sounds and it the idle goes up and like somebodys pressing and releasing the gas