Check the small-bore vacuum pipework on top of the inlet manifold as stated - my car lost most of its power when a small bore pipe was not connected to the black plastic box on top of the left hand front suspension tower. Also check the variable vane actuator lever on the turbo moves freely and smoothly.
EGR issues can affect this engine and usually lead to hesitant and smoky running. The valve gets clogged with oily soot and can be cleaned or replaced if required.
First & easiest thing to check is al the presure pipework between the turbo & the inlet manifold, for splits or leaks. Hole might close up when not under presure so can be hard to see, but oily patches and oily spatter on nearby components can given them away.
Similarly, check the jubilee clips at the pipework joints are tight and not leaking.
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