I have a 1987 300d turbo. when i open the line of the first injector the pressure is high and come a lot of diesel and the cars revolutions dropped. But when i opened the rest of the injectors the amount off diesel is very low. The car is smoking a lot. A truck diesel mechanic told me that the ip pump is not good and i need to replace it. But i am not sure of that, the only thing i did was to changed the o rings and the washer of the valve elements. But when i was doing the first injector i loose the spring of the valve element. But no deal because i have another pump and I replaced it. The injectors nozzles are news and calibrated to 2,000 psi. The car start fast, but has a fail. It is possible that i need to sent to calibrate the pump? if it is so, how much is the cost for that? I am from Edison, New Jersey. I do not want to go to Ray Catena (mercedes dealer) because they was bulling at me when i told them my car is a 1987. We checked the whole system, looking if something was clogged, but everything was right. I am thinking that the first injector is injecting too much diesel and maybe that is the problem. if you have any advised i will be very please to follow.