I have a 2003 F250, 5.4lt (?) motor. It was running fine. I went to pickup a Washer and noticed the gas gauge was not moving, sure enough I coasted into a gas station and got $20.00 worth. After that (+ 2 months ago), it immediately started sputtering under load. It idles just fine, however, when you are driving, it will start sputtering and I have to mess with the gas pedal to keep going, weirdest thing! So, it's been long enough to know it is not water in the gas, I have replaced the fuel filter, which did help a little. I would liken it to a spark plug "missing" except I have fuel injection. I check all the coil connections, put fuel conditioner in it and it is still missing? However, like I said, it will idle all day just fine. Anyone have any ideas what I can check or do next? I have zero trouble codes, replaced the filter, and now I am running out of ideas on what to try next? It is weird how it suddenly started doing this! Someone said I may want to check the fuel pressure regulator? I don't know what of where that is even? Any advice is greatly appreciated!