I have a 2006 f150 with the 5.4 and 160,000k in it, over the past few days it has been sputtering or misfiring when I accelerate slowly and the engine is at a low rpm. It happens between about 30kph and 90ish, I've read other posts that have the same problem and most agree it is the coils and/or plugs. The only difference with mine is that if I turn of the overdrive it runs perfectly at all speeds. Any help would be great. Thanks

 

It's the plugs, get them changed. After awhile you will feel it even with OD off. 160k with original spark plugs?

 

Nope it sounds more like a coil. Buy 1 and swap them around untill it goes away. Cheapest way to do it in my opinion. And is that 160 killometers or miles?

 

It's 160000 kms, thanks for the help guys I'll give both ideas a try this weekend. I bought the truck with 100000k on it so I'm not sure if they are original. I'll post back my results, thanks again

 

I had this issue, took it to a transmission shop and they said I needed a new transmission. Took it to another transmission shop and they said it was spark plugs. Got them changed out, and I believe the original coils, and the problem is gone.

 

Yes I agree but. If I were him I would put it on one of those machines at autozone they do it for free and it will tell you with cylinder is miss firing.

 

I wasn't getting any misfire related codes

 

O yea then I would do what that other guy said. I,acually did that on my 2000 model.

 

I have had and currently having this same issue. When I bought my truck I took it back the same day to the dealer and they installed all new spark plugs. After waiting around all day I left again and it still happened. Took it back and come to find out two of my Coil Over Plug's were bad. Left it over night came back the next day and took it home, no problems. Now a year later it has started doing it again so I know now that it is a COP problem. So most certainly buy one and filter it through every cylinder to find the miss firing plug.
IMHO the way you are able to tell the difference between the "miss fire" of a bad plug and a COP is how the truck feels when it happens. From what I've learned a bad COP will cause the truck to "bump" or "jolt" like you've just ran over a pothole or speedbump. Where if it's the spark plug, you'll have a "bogging" feel or loss of power along with random "bumps" while driving.
There is also another thread on this site that has a tutorial on what the Ohm readings should be on your COP's and that's how you can find which COP it is or determine if it's a plug that has gone bad. Here is the link:
https://www.f150forum.com/f6/how-test-coil-pack-17249/?ref=esp-link

 

Well here's the results, I went to Ford and bought the plugs with the intention of doing them myself. I did a little more research and apparently this year of truck is a nightmare to change the plugs, ie they can snap and parts fall the engine, so to avoid that I took it to Canadian Tire got them to change them and check the coils, turns out coils were fine and she runs mint with the new plugs. Thanks again for all your advice