This is my second post, so bare with me..
I have a 2004 FX4 CREW with a 5.4 3v. The problem I am having is that I am lossing power on full throttle. When you get into the gas the truck dies has like a flat spot and you can hear popping from the engine. We "the dealership" changed the fuel pump and the PCM or ECM. The truck still does the same. I personally checked the fuel pressure and it is around 12lbs at idle and under revving it drops to 10lbs. Is it just a bad fuel pump or any one have this problem please help

 

hmm could be fuel pump, idk if injecttors could be a problem, or if your computer is way out of tune. Is it heating up pretty hot?

 

My truck did something similar when I had about 1600 miles on it. The wrench light came on, I was able to limp to the dealer, about 20 miles. It threw a code though, they replaced the throttle body, no more problems.

 

its not heating up and no codes come on at all. I have never had a code on this truck even with this problem. The injectors are perfect according to the computer sheet just low pressure and drop after acceleration