Randy Goldstrom

hi guys i have a 2005 f150 5.4 and it just recently 3 weeks ago started missfiring very bad and knocking extremely loud and this would only happen when the truck would hit a 1k rpms and come down (backing out a a parking spot, moving forward at a stop sign ect.) then it started to spudder adecent amount light to light, truck is fine on start up and drive for the first 30 45 mins then it will idle perfect and run great on free way but after that 30-45 mins it spudders light to light and it takes it a second for it to kick in,

my plugs have a 100k on them i replaced 4 and im hoping to replace the other bank today. just risky with the plugs breaking!!

has any one had this issue or have any ideas on what i need so i dont spend all my money on the wrong items.

any help would be greatly apperciated!!!!!!

thanks!

bobkyle2

Moved to appropriate section.