V8 starting/idle issues - I know, not another one!

Hi all.

I have recently got a 1996 3.9 V8 Disco, with, wait for it...

...Starting Issues!!!!

Just to start, it is LPG converted, single point, and runs sweet on LPG, but not on petrol.

The fuel pump sounded ropey so purchased a new Bearmach one, fitted. Couldnt get is to fire properly on petrol, so checked fuel to rail. There is fuel. Thought it could be a pressure problem so crimped the return line. It runs. Purchased and fitted a working fuel pressure regulator, same thing, runs when crimped stalls when released.

I have almost got to the point of vice grips removed and close to idling, but not quite.

Any help would be grreatly appreciated.

Thanks.

DaisyDisco

Also posted in Engine section.