[behind-bars]

First off welcome to the forums. but you may have better luck starting a new thread in the 4.9 sub-forum, But the consensus you will probably get is that lucas treatment and other "additives" really dont solve many problems, they can cover them up a bit but dont last.

Few things I would look at, If they dont solve it start a new thread and you will probably get more help from everyone else.

Do you have any codes? Press off+warmer and see if any show up, their is a sticky thread in the 4.9 forum with more details.
Knock on acceleration can often be caused by egr and timing settings. If you aren't already try running a higher octance fuel and see if it improves.

I would also hit the basics like making sure your not low on oil or antifreeze.