Ford-350 7.3 Power Stroke Turbo Diesel does not accelerate

It is a Ford F-350 truck of 99 Power Stroke 7,3 liters Turbo Diesel, the CPU is changed the main and the problem is that it pulls white smoke in low the hot or cold engine and does not accelerate to more than 2500 rpm can help me please the mechanics do not meet anything and already spend a lot of money trying to repair the engine

From what you explain, it may be that the engine is under recovery or some value outside and the switchboard goes in safety and does not leave 2500 laps, of power as it is, check the EGR to see if it is open but normally you would throw black smoke check the oil consumption and check the turbo can be that it is broken the retain and this passing oil to the exhaust checks these points to see if you can see if Some diagnosis check the parameters you have and compare them with those of the manufacturer.-