Hi, recently purchased a 2004 toyota corolla with 150,000 miles. I looked in the hood and noticed recently there was a piece disconnected and I am unsure of what it is? Also, my car has been reving itself sometimes (not all the time) i usually notice it after it’s been sitting for a while. It only happens really when it’s in drive and i’m sitting at a light sometimes. I am thinking it could be an O2 Sensor problem (mass air flow intake problem?) or a vacuum leak? It tries to put itself in 2nd gear in the morning when I first start it, but after I shift to drive, there is no problem. If anyone has an idea or can help it would be greatly appreciated. Sorry if what I have described doesn’t make sense (i don’t know too much about cars). Thanks! Have a blessed day. (I have attached pictures of the piece I was referring to at the beginning).