1998 5.4 engine question

[homermandy]

So this is not my daily driver. Noticed a while again intermittent power issues. This engine has about 100k on it. Long story short I replaced injectors and coils and also put in new fuel filter and pump in the tank. Still had issue. So removed entire exhaust and only have manifolds on. Loud as hell but still stumbling when pressing pedal. Idles good but when I smash it the engine rumbles and hesitates. I can get full throttle but in steps. Any ideas? With exhaust off should I have this issue? Does it need the o2 sensors to not behave like this? Before I get new manifolds and exhaust and spend $$$$ need some advice. Thanks.

 

[Junkyard Jack]

2002 Expedition - Won't rev past 2400 rpm in park or driving / won't accelerate

Hello! I have a 2002 expedition that I've been trying to track down an issue with. The vehicle will NOT do any sort of medium to heavy acceleration. In park, the vehicle will not rev above 2400rpm if you go WOT. If you give it about 50% throttle, it'll climb to redline. When driving, the...

www.expeditionforum.com

Does this seem to be the same issue your having?