I have an 03 f150 5.4 4x4 with 100,200 miles. It has a weird noise when i start it, it usually only does it on the initial start of the day, and it doesn't always do it. It sounds like a shutter noise i guess I could call it that. I also noticed than my exhaust manifold is leaking, so I am curious if it is that or if something else is going on. Any help would be muchly appreciated, thanks.