I have a 94 k1500. During acceleration it seem to lack the power that it should have. You can feel that it is sluggish then sometimes it will come into to it and take off more like it should. It is very erratic. I have checked fuel pressure and it held steady at 15lbs. I have changed fuel filter, plugs, wires, coil, and tps. Could it be the fuel pressure regulator? Im at a loss. When I pull my boat you can really notice loss of power. Starts and idles good. Any help would be greatly appreciated.