Oily LPG contamination is my wild guess. When I do experience rough idling, I usually run on Gasoline for a few minutes and then switch back to LPG. Somehow SGI injectors need to untangle its stuck up tiny pistons. On severe cases I do unplugged the LPG hose from evaporator/condenser to the injector rail and rest it for some 10 minutes and plug it back, usually rough idling goes away.
I usually have half tank Gasoline when travelling, so I use it whenever I need to![]()






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