My son has a 93 F150 with a 5.0. We have changed the plugs, fuel pump in the tank, fuel filter, plugs, wires, coil pack, distributor cap and rotor,....maybe that's it. It idles fine and even reves nicely but under load it goes to crap. It will spin the tires on grass/dirt but when asphalt is involved it spits and sputters and pops back through the injection system. Where do I go from here? Pressure regulator? Are there some sort of sensors I need to replace? Any help would be greatly appreciated!