I got that 5.4 Triton (2005 F150) that had the sparkplug issue....bought the truck new in '05 but only has 62,000 miles on it.
Started bucking and kicking and rattling....wound up being two bad coil packs but plugs needed to be changed...6 of the plugs broke off and had to be drilled out....with that and two coil packs tune up was $1,200 dollars!!!!!!!!!!!!!!!
Most expensive tune up in my whole life!