i have a 01 f250 with the 5.4l and it started missing really bad so I checked the obd and had a miss fire on cyl 3 so I did plugs on it and replaced the coil pack on that cyl, it has more power but still isn't running right from time to time while driving it gets a skip around 40mph or when giving it gas off the line, if I turn over drive off it doesn't skip and acts normal, cruzes fine at highway speeds and stuff just skipps a bit while getting up to speed iam not sure what to do now because it doesn't throw any codes, I replaced the plugs with the ford motor craft plugs

 

What's your fuel pressure at idle, off-throttle and WOT?