OK i have an 04 F-150 5.4 with 70k on it....

from stop to go its fine, but when i get up to whatever speed im gonna go and try to excelerate to go faster or to pass it stubbles.. and today it stubbled a little more than ususal the engine light came on for a minute then went away....anyone know what this is....

 

plugs sound like a must !! mine does that too well started to lately

 

Mine did that and it was a COP.

 

Dbl post

 

Stock programming is known for being dangerously sluggish. Mine use to refuse to get into gear when I was suddenly forced to punch it while going anywhere from 20-35 MPH. Damn near got me splattered on a few occasions.

 

sorry but i dont know what a "cop" is...

thanks for your replies

 

I'd probably start with checking for codes. Address whatever problem the codes may indicate, and go from there.

Also at 70K, I'd get someone who knows what they're doing to replace the plugs. How's the air filter look? What about the fuel filter, have you replaced it lately?

 

thanks

 

COP = Coil On Plug.

 

Just pulled codes P0171 and P0174. TSB states PCM reflash. Might call ford up and figure this out

 

I had a P0171 code on my edge, so I pulled the edge out and took it to the dealer and told them the symptoms. The tech hook up a laptop and we went for a drive. He asked me to make the stumble occur, I did and he showed me the ignition on CYL 1 drop to zero exactly as the stumble happened. They changed the COP and the plug...been great ever since.

 

i just took my truck to the local autozone and they scanned it ..... NO CODES!! wtf... still have the problem..but it seems to not be doing it as often.... not sure what to do...

 

The AZ scanners won't pick up the code, you need the dealer's scanner.

 

guess ill have to take her in then... didnt want to..

 

If the CEL doesn't come on, then there will be no codes. You're going to have to catch it in the act.