I've got a 4 ltr V8 that runs only on LPG, no petrol. Its running rich, which means it stalls when cold, cos the gas running into the regulators stays liquid, when its freezing. Once warm water pumps round the regulators, she starts and runs like a proper motor. The supposed 'gas expert' says he cant adjust the trims because you need to set it up on petrol, on the computer, then the computer automatically sets the trims. I think he is full of shite. And is a computer geek, not a mechanic. You must be able to set the trims, regardless of the fuel? Any advice welcome.