i have a 2005 f150 fx4.I have to odd low rpm studder at about 1200 rpm when it kicks down while i drive down the highway. Its couldnt be anything with the transmission because it seems the fuel is cut off and then it picks up again. There are no studder problems at a higher rpm, just at roughly 1200-1500. Thanks

 

How many miles on it? Sounds like it's time for a tune up.......heaven help you with the spark plugs.........

 

I have the same problem, 163000 miles and changed the plugs 35000 ago. Of course I did not do the coils at the same time..........Do it all over again and do the coils as well?

 

Check condition of plugs. You can try new boots and springs first, instead of the entire coil. Everything else maintenance wise up to snuff?

 

Yea everything else has been maintained as far as oil, sensor replacements, belt, pulleys, etc. Thanks for the advice.

It would not be the Cam phaser non-sense would it?