Sounds nigh on exactly like the prob I had with mine, and turned out the rings were fucked, causing fook all compression to all bores

Stinks of fuel (gets past the rings into the oil and then pumped into the rocker area with the oil so you can smell it...

Revs dropping off when de-clutching and being generall eratic all other times. Often refusing to start or idle unless you force it to

Air box had oil in it ( )

So it's either his rings are bolloxed or the ISCV is total tits up