I know this has been been discussed before many times and have read most all of these discussions, but for the life of me, I cant figure it out. This issue is the stutter/hesitation at 45-55mph under light load and sometimes on flat road. I have no MIL light on, no codes. Normally happens when you ease up to 45mph, slowly let out so rpms drop a little, then roll back into accelerator, then rpms drop slightly and then dun dun dun dun dun and it sounds like an exhaust leak is also present on the passenger side when it does this. If you let off the pedal it comes out of it. It also comes out of it when the throttle is depressed harder. RPMS jump up fast when throttle is depressed a little harder. Otherwise the truck runs and idles fine.

I've done the following so far.
Changed all 8 spark plugs
ran a can of sea foam through a tank of fuel
cleaned the MAF and changed the air filter.

Any ideas on what else this could be?

Thanks in advance.

 

One or more coils. Did you replace the boots when you changed the plugs, and did you use Motorcraft plugs? What engine do you have and what torque figure did you use on the plugs?

 

what motor? Sounds almost like a blown plug.. Rare for that year..

 

Original poster here - It has the 5.4L and has 62K miles. I've done the following since it started acting up a few weeks ago.

Changed all 8 spark plugs - replaced with motorcraft plugs, torque to 25ft/lbs
ran a can of sea foam through a tank of fuel
cleaned the MAF and changed the air filter.

 

You should take it in and have it checked for leaky injectors. Ford extended coverage on that year to 10 years 100k miles because of injectors that are **** to fail. See the sticky at the top of this section.

 

I'm aware of the injector issue and already had a first hand experience with them failing and hydro locking the motor. I've got an appointment to get the truck in the shop on tuesday hopefully its just a bad coil. fingers crossed.