300 tdi Running Problems..

A question for a mate really, but he has a 300 tdi es auto Discovery.
When driving it under normal conditions it drives ok, if anything it is a little under powered. I think thats down to a Turbo problem?????? there seems to be a blowing sound when the Turbo spins up, a bit like its leaking if that doesn't sound too silly...

When approaching a hill it drives fine, going up hills is a little slow, but when reaching the top and levelling off it seems to die. All the power seems to dissapear and there's a plume of black smoke.
Anybody had any similar experiences????

i was once told by a mechanic that a lot of turbo problems were down to gaskets the next big failure being disintegration of (fan blades) hope its a gasket then. that was about a montego 2.0 td engine so not totally dis similar (very general comment there)
mark d

check that none of your hoses to or from turbo arnt leaking also check air filter

the turbo don'st really give trouble black smoke check for split turbo hoses,

Sorry guys i should have updated this ages ago. It was a split hose between the turbo and intercooler. It was replaced and is now running well..