http://users4.ev1.net/~sanaghan/Vehicle/Index.htm
Scroll down to Valve / Lifter noise for a summary of all the disucssions. More recent discussion have been on adjusting hydraulic lifters.

It does depend on what engine you have. I was just educated that the 3.2 chattering is hydraulic (solutions above work) but the 3.5 engine is different and the solution does not work.
3.5 Info here

Try searching Tech on +engine +tapping
Go back "Older than 1 day" to get all results.

[color:"white"]? 04 Rodeo DI ?[/color] 75k mi, body damage on the 1st weekend I got it.