here is an update on the situation got back to the shop started truck ran good for the first five seconds started to go under a load cracked the injector line for number cylinder number one, engine ran smoother cracked number two heard a distinct cutout, switched pumps between one and two did not help the situation problem has been narrowed down to number one cylinder removed wires from pump checked for an open circuit on the wires it was open leading me to believe that it is a mechanical problem. in the cylinder or in the injector seat or in the line fittings if they are cracked i am also going to pressurizd the radiator and start it to see if there is any white smoke out the exhaust. Is there anything else that should be checked out?