I'd be amazed if it was anything other than electrical. LPG is demanding when it comes to ignition components.
On another note, you may recall you don't actually have your valve saver set up correctly do you. As it does not use any oil.
yup miss the obvious first step or thinking about that direction more is the plug ok?
7 horsemen of the apocolipse rode up the street and i told them to fook reet off, its only plugs ya twats