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I have a 2007 Ford f150 5.4 3v engine, we have replaced plugs, coils, pcm, O2 sensors, and I still have no passing power.. The vehilce runs great up to trying to pass a vehicle, then it just bog downs and has a little back fire. I have a lot of money invested in this vehicle and I sure could use some help. We are not getting any codes.
I had an '05 FX4 w. 5.4L and I had the same problem until I got an Edge tuner. With the Edge I had no problems passing, before, I would punch the gas pedal and the truck would roar but not move but would gradualy get the job done.
The Edge also solved a mpg problem as well, no matter how I drove; hwy or city it would only get 12 mpg. After Edge I was getting 13-15 city and 17-20 hwy.
I had a the same problem on my F250 5.4L 2V, did the plugs, coils, both o2 senors, Throttle position sensor, Had the cats checked for flow, fuel, filter, and a couple other things too. What finally fixed the incredibly weak power (and occasional miss under hard acceleration) was ...a rebuilt set of fuel injectors that I bought on E-bay for about $100. Seeing as you've already done most of the things I did, it's a small price to pay to rule them out. Bonus for me was a 2 mpg increase right before a 4200 mile trip, they paid for themselves immediately.
2013 F150 Platinum 3.5L Ecoboost
2011 F150 Lariat Plus 3.5L Ecoboost (traded in on 2013
2000 F250 Superduty XLT 5.4L, 5 speed manual w/granny 1st gear
2001 Expedition XLT 5.4L (Ex wife got to keep it)
1990 Bronco XL 5.0L (gone but not forgotten)