Hi, everyone I'm new to this forum and need your help. I have a Ford 2005 power stroke excursion with no mod other than a turboback 4" exhaust and gauges. Recently started hearing a noise which appears to be coming from the engine compartment. It appears to occur after lifting my foot off the accelerator and the truck is coasting. It disappears with giving the truck gas or when the truck is near a complete stop. Its difficult to describe but sounds like a low tone muffled rattle. I have sound clip and you can hear it after the truck engine accelerated, but I am having difficulty uploading the file to the forum. Can anyone help me upload this sound clip. Any information or suggestions regarding this noise would greatly be appreciated.