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Lost power/misfire/white smoke

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Recently bought a 2000 TD5 with 119k. Shortly after, it overheated - blown bleed hose.(bodged by previous owner) Garage discovered & replaced fuel pump which had failed at the same time. A week later it started losing power when towing - garage identified & freed sticking wastegate. A week after that it developed its current problem - starts, has bags of power, for 5 minutes or so, then loses power, revs drop to 7-800 & emits huge cloud of white smoke, which smells of diesel. It then sometimes emits occasional burst of black smoke while ticking over, if throttle is opened. On one test run it suddenly regained full power for a few minutes, then lost it again. Previous owner has removed EGR No sign of oil in water, or water on dipstick, or sludge under oil filler cap. Only error message on fault code reader is: Manifold pressure sensor logged
Steps taken:
1.Fitted new fuel & air filters & injector harness. .
2.Garage has replaced several sensors, (MAF etc) with used units - no improvement.
3. Had to top up coolant with say 1/2 litre after garage fitted new bleed hose, then again a couple of days ago.
4. Have added Steelseal to coolant yesterday; also turbocleaner to fuel (that may have caused the burst of black smoke seen shortly after, when opening throttle whilst engine in limp mode}
Advice please

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Have replaced cylinder head; found small cracks at each of the glowplug ports of the old head. Extremely disappointed that problem 'listed above is unchanged. Hawkeye returns 3015 DTC & says manifold pressure low. Help please!

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Finally found problem today- partially collapsed turbo > intercooler s-shaped hose restricting airflow - car now running perfectly - so far! Thanks to all who've sent advice

 

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