I took the car to the dealer for a computer diagnostic, that came up with "Zip".
The problem seems to be getting worse with low power when the engine is cold .............. damn thing hardly moves until the engine is warm. I replaced the Air Filter last August so I doubt it's that. I ordered a new fuel filter today 'cos that might be dirty.
How difficult is it to get the injectors out? There's a local garage that will refurbish them for me.
I heard all kinds of horror stories but the car only produces this black smoke with an rpm change otherwise it'll still do 160 Km/Hr (100 MPH) no bother.