help! hilux 3.0lt diesel, page-33

Yes fuel to pump, and Its getting to the injectors but not with the pressure it should. Only a dribble at the injectors? It seems like a pressure problem. With the motor change the computer had to have all the different injector numbers inputted into it. Have checked that twice and there right. Changed fuel pump back to my original. Still the same, filters replaced. Full of fuel? Checked timing belt! All the relevant fuses changed? To me, and Im no mechanic its a computer problem from my old one not matching the exchange motor? I will give the mechanic today and tomorrow and then I have to try somewhere else. I feel for him, He is really trying but with no luck. Because it was a change over, I use my normal mechanic to save a bit of coin. But I have to go to the Toyota dealer next. They have come to his workshop and gave advice, but I think it was a token effort. You know the way it works guard all the information, fix it later and charge a fortune to make them look good!
Dr