HI there, i have a Tdi PD 115 VW passat, its done 96K, the symptoms are it hesitates under load, particularly in 3rd, 4th and 5th gears and when it hits around 3000 revs it like stops boosting? (like its hit a wall?)

The Vagcom came up with only one fault code which was "fuel temperature sensor", i replaced this but it made no difference. (the new part came with the sensor and housing, but i only replaced the sensor, seemed pointless replacing the housing as well, but maybe thats where im going wrong?)

Now no fault codes are showing

I have bought a new MAF and a new MAP sensor, neither made any difference. Next we cleaned out the EGR valve and manifold, this made no difference. Then i replaced any dodgey looking vacuum lines, none looked that bad? we even tried putting one of the vacuum lines straight onto the actuator to see whether the turbo arm went up and down and it did? Seems there is a vacuum?

Now really stuck as to what to do next, people have suggested changing fuel filter, replacing the housing to the fuel temp sensor, cleaning the MAF connector, replacing the thin hose that runs from the exhaust near the turbo to the ECU? ? dont know whether any of these things will help or if there is any new ideas people might have?

Thanks in advance

Natalie