I have a 2012 ccsb deleted. I'm having a problem with the rpm trying to raise up on it's own. After I drive the truck for a while the rpm will raise on it's own, if I put it in park it will surge a few hundred rpm. If I touch the throttle it will take off 3 to 4ooo rpm until I turn the key off. There are no codes present. It started after I changed the oil about 300 miles ago. I changed the oil, drove about 15 miles then stopped for fuel. When I started the truck after fueling up, the rpm started to race as soon as I started it up. It did this twice. Then I shut it off for a few minutes then started it up again and all was normal. Haa anyone had this problem before? Any help is appreciated.