Good news and an unfamiliar rattling noise...
I just bought an early '99 to replace the one that I "gave" away to my ex. It hasn't even broke 100,000 miles yet, and the previous owner kept it pretty much stock. In the week I've had my hands on it I finished installing an Edge Evolution, put in the DIY intake, and rerouted the CCV. I am pleased as punch. I'll be ordering a 4" turbo back exhaust next month and probably a tranny temp gauge. I hope to be running on SVO by early summer, but time will tell. Whatever happens I am glad to have a power stroke back in my life. If you can't have a woman you might as well have a truck!
Anyway as I am getting used to the new sounds and noises of the truck I've noticed one that seems odd to me. When the truck is idling (regardless of cold, warm, or hot) it has what I would call a rattling sound. When you stand right beside the hood you don't really notice it, but if you get down by the wheel well or even crawl under the truck it is much more distinct. I know that these engines tend to "cackle" because of the dead head #8 cylinder, but I don't know if its related. Anyone out there ever had any experience with something like this? The truck runs awesome and is hardly lacking power. When you're on the gas the noise goes away. I hope its just the anxious new truck owner in me.