The 5.4L 3V has an issues with oil flow on the passenger side when it comes to roller rockers usually around the number 2 and 3 cylinders. You can help this by running 5W20 only, change it often as well as no cheap oil filters. When a roller goes out on this side you should replace ALL the rollers as well as ALL the lash adjusters. On the 3V motor the lasher adjusters can NOT be removed with the cam in place. So if your replacing the cam, spend the extra few bucks and replace the lash adjusters.
As a side note you should check the screens on the VCT solenoids and listen for any cam phaser knock. People claim that a noisy phaser does not cause any issues but my opinion is that it puts added stress on the much smaller rockers of the 3V motor. (The 2 valve motor has much larger rocker arm bearings that can handle more load.)