HELP Broken Down for Christmas VN6 S1 stalling

[wez]

My motor runs rich and soots up the (new and previous) plugs almost immediately. The car starts cold, and stalls after one block.

This came on after some recent work;

Just before the problem, I had my exhaust sytem replaced, some new bits some 2nd hand.
Could an exhaust system problem change the mix, as suggested in another thread?

Other recent changes were change of transmission, and change of DFI which had failed ( on the way back from the exhaust/transmission change),

and change of external petrol filter (NOTE the old one was full of rubbish: assuming more fuel now gets through, could this be the cause?)

Any help would be appreciated. I am a musician with gigs to do over Christmas.

[pow3rslave]

depending on what the did to the exhaust, a bum oxygen sensor could make it run rich, but i doubt it'd cause problems to the extent you're experiencing. is it showing any engine faults? check the fault code using this howto
Checking your Computer for Faults (VN - VP)