hey guys im new to this site,i have a 2005 f250 5.4 that has a #1-#8 miss fire i have put new plugs in it and changed the cop's but now it is still doing it the truck will not even pull itself i can not go over 30mph or over 3000rpm i really need to get this fixed please help im new to this style truck also ....... oh and it has 200,000 miles on it
well i have used my scan tool to clear the codes . i also just put a new fuel filter on 5 min ago and it still is doin this,i need to get this fix before tomarrow or my dad is going to take the money for my school 2 buy a new truck and i want to go to school. i just dont understand why it is always the same to cyl even when i switch the cop's from other ones that dont miss... please help thanks

 

also it has a engine lean code i think bank one

 

ok i think i fixed the problem the fuel pump was weak , changed it and then started it ran a whole lot better but still didnt have that much power,so i then took the y pipe off and bingo there it was looking me in the face the pass side cat was melted and pluged up ...

 

Thank you for sharing with us what you found. Glad it's running, again. Enjoy academia.