Hello, i have a 2000 f350 7.3L and I have been experiencing a weird hissing noise. Whenever i let off the throttle my truck releases a huge amount of air which I am assuming is the wastegate actuating. However on the highway in 3rd and 4th gear there is a constant hissing noise and the more i push on the throttle the louder the noise gets. im not sure if the wastegate is staying open and or if it is supposed to be staying open on the highway. And before we even go down that road yes it happens when the truck is warm as well and its not related to the ebpv and mine is unplugged. someone please help as i am very confused and dont want to damage my truck.