help please

1997 4.6 lpg

hi guys my rangie is a bit sick wondering if any one has any ideas to help me please,

she starts fine, first turn fires straight away but runs rough on petrol when cold, as soon as she goes onto gas its fine also fine when warm running on petrol ???????????????????


thanx

Some LPG conversions are a bit touchy, there’s a fine line on tuning, I would surest you check the ignition timing, some time the engine on petrol some on lpg