Hi! I own a 2001 Chevy Tahoe 5.3 L. I’ve got an engine noise, or at least what I think is an engine noise, that only occurs while I coast while in drive. I don’t hear it if the car is in park and the engine is just idling. The strange thing about the noise is that it goes away as soon as I just lightly tap the Excelerator. So it only comes on when I take my foot off the Excelerator and Coast. Any help would be appreciated trying to find out what this is. Thanks!