So difficult to diag engine noises over the internet. I even did a video but can’t seem to pick it up. I can hear it at idle inside the cab. It’s not a knock or tick, more like a “shaking” or rattling sound. Definitely engine related as it picks up with acceleration. Almost sounds like an idler pulley or a bearing going out. I’ve read about a lot of water pump issues on these 5.0s. My truck isn’t leaking any fluid, but could the bearings be going bad in the pump? Do these trucks have a history of idler or tensioner issues? 70K trouble free miles so far.