If you have a loud ticking noise in your 04-08 5.4 your Variable Cam Timing Solenoids may be bad. There have been a couple revisions and you can get the newest ones at your dealer for around $60. This link has a good how-to on the 04-06s. 2007-08 require you to remove the valve covers and do the same thing. You need part # 8L3Z-6M280-B HOW-TO: with pics and video VCT Solenoid Pictured is all 3 variations of solenoids... The middle is the first revision, and the right is the original.....
swapped mine out today took alot of pics for a writeup but this it's pretty straight forward lol. I'll still make one if anyone wants me to overall it was easy. the old seals were a pita to get out but the vct's came out and went in with no problem