I have a 95 Yukon I use to pull my FJ40 and even without the 40 hooked up the Yukon is sluggish as hell up hills etc... The motor uses little oil and has been very reliable so I am shying away from rebuilding it yet. (Mainly cause I have little experience with rebuilding motors) I changed the air filter, fuel filter, plugs, wires, etc.... I need an inexpensive way to give the truck new life again.... KEY WORD-Inexpensive- I have heard that getting a head reworked helps-what does this involve and would it help my tired motor? Any other ideas?