Oily residue and misfire?

[cadiddy]

Right chaps, My daily 1.9 80 is starting to show its 190000 miles, barely though!
It has a loud whistle from the turbo (top boost hose?) and when i removed it to try and fit a length of temporary replacement i noticed there was quite a build up of oil (sooty black sh**te) which you could actually pour out. Now i'm guessing this isnt normal but would like a second opinion, also at about 90 on the dual carridge way it will cough and become quite jerky until you back off and speed up again, this is also followed by a cloud of black smoke. Could the 2 things be related?
TIA
Cadan

[colm9944]

Well I'd say fuel pump for the stuttering over 90, two of mine did it.Common enough I think. Drove from south of Spain to Dublin with with one them doing it. Not sure about the gunk in the pipe though?

[cadiddy]

Yeah it's not something that seems to affect the car in any way other than at cruising speeds and steady ish rpms, also it doesn't do it all the time, but if it's not connected with the oil residue then that's one thing I guess
Cheers