my 08 4.7 was a lil fussy at idle once inna while. like it was thinking bout stalling. never did tho. i replaced my plugs (16) with denson iridium. truck seems to run strong. decent amount of headlight dimming tho. if i turn the heater on theyll dim, roll the window down theyll dim. etc. might put a beefier alternator in. got the truck used at 60k did the sparks first and doing trans flush and filters next. shifts a lil funny around 3k

 

I put the pulstar iridiums in my 08 4.7 but changed the top ones back to own. Good luck