I have no idea what's going on anymore

[Dmpsix]

I haven't ran or touched the 2003 5.4 Expedition in roughly 2 years.

Changed, o2 sensors, fuel filter, spark plugs, ignition coils, oil and ran some seafoam top engine cleaner. Cleaned out the throttle body, sprayed the MAF sensor and replaced the terminals on the battery.

Car has a vacuum leak somewhere for sure, loss of engine power and a rough idle (maybe due to the misfires?)

Not sure what the heck to do here or even where to start... I was messing with the scanner tool and wiped the codes for my state inspection so I would pass. Other than that, not sure what to do here....

 

[Yupster Dog]

Check for vermin and possible damage they might have done.
Check your major ground wires to make sure good connections.

 

[Dmpsix]

Nah, no vermin damage and I just changed the terminals

 

[00XTL]

Have you tested the battery. Sometimes a low battery will throw wild codes

 

[riphip]

Vac lines are old and toasted (if never changed). Replace them all. Cheapest repair of all.

 

[Ty Markle]

Sounds like what I went through. I replaced the throttle body sensor and boom all good. Mine has gone out twice....when on the highway it always starts out feeling like the transmission just slips...nope throttle body sensor. Easy diy cheap fix. Hope this helps

 

[Dmpsix]

Sounds like what I went through. I replaced the throttle body sensor and boom all good. Mine has gone out twice....when on the highway it always starts out feeling like the transmission just slips...nope throttle body sensor. Easy diy cheap fix. Hope this helps

Let's hope so! I'll give that a shot, thank you!

Edit: Did you mean Throttle Position Sensor?

2003 FORD EXPEDITION 5.4L V8 Throttle Position Sensor (TPS) | RockAuto

 

[Ty Markle]

Sorry for the delay man I didn't see your reply. Yes Throttle position sensor. Did you get it squared away?