99 Expedition 2WD XLT 5.4 help!

[Anbner Alvarado]

I’ve been trying my hardest to maintain my vehicle and recently it has started to stutter at certain speeds and even when I’m idle. Something that it’s never done before. I don’t have a check engine light nor any pending codes so I’m puzzled at what it could be.

 

[Plati]

Could be a lot of things. Nobody could know, I don't believe, without understanding the maintenance history of the Expy. Have the air cleaner, fuel filter, and spark plugs been replaced … when? List goes on & on.

Cant do diagnosis without evidence.
Did you pull codes and none listed?

 

[Anbner Alvarado]

I have changed the air filter, I changed the mass air flow sensor about 2 months ago. I have changed 2 coil packs the 1st and 4 th the only codes I got on the scanner. I also recently had my engine rear seal changed for a leak. The last owner said he replaced the spark plugs but I won’t have any history on that.

 

[Plati]

I don't know if its like this post I had on my 2003 5.4, but sounds similar?

https://www.expeditionforum.com/thr...-after-weeklong-rest.35179/page-2#post-297351

 

[Anbner Alvarado]

Yeah it sounds kind of similar but scanner is not throwing me any codes at all so it’s hard to tell which one of any is the bad one ?

 

[Aspitler24]

I’m having the same issue on my 2001 5.4L V8... same symptoms, no codes pending or stored. Odd thing is I changed the battery today bc the vehicle had been sitting for around 3 months in my driveway bc I was afraid of doing more damage- the rough idle is now almost non existent after a few test drives, acceleration is at least 70% better, and I haven’t seen the CEL (MIL) flash or come on and stay like a few times before. I just didn’t think a bad battery would cause those symptoms?

 

[riphip]

Again, keep it simple before throwing parts at it. Could just be vacuum leaks. Hoses w/heat & age wear out and crack.