Hi Phil,
I dont have much of a clue really. For some time i thought it may have been more of a general engine problem and i had been replacing parts all over the shop (coils, plugs, EGR etc).
I think the car probably had a number of small issue's when i bought it which i suspect were down to David not using it for a while before he passed onto the trader. David told me it had been sitting for a while.
The car spent some time with Corin Messenger about a month ago for MOT and i think he was pretty impressed. Corin had a good look at the engine and could find no fault with it apart from the LPG not working. Because LPG is not one of Corin's specialties he wasnt able to look at it further.
It may be something as simple as the fuel trims are out, sticking injector or valve but dont really have any LPG knowledge, so am only guessing.
The car runs perfectly on petrol and i havnt tried the LPG for some time now as the tank is empty.
Regards
Graham