Originally Posted by 00-tempe-teal

Ok guys it's definitely the exhaust manifold, passenger side. Good thing is the nuts don't look too awfully rusted. I think the sound that people thought was a lifter is actually something in the a/c system, as it only happens when a/c is on. I'll have to do some research on that. Thanks for all the help everyone. Hopefully I can find some time where I don't need the truck for a day or two to get this done.