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Depending if it is backfiring out carb or out exhaust will tell you if the time is off. The carb backfire is a sure sign the timing is off. A valve is not completely sealed off before ignition and it explodes before sealing off the chamber. This also could mean a burnt valve as well. AN exhaust pipe backfire could be a few things. Raw fuel in muffler that ignites from the heat. Over rich mixture, timing, jump timing belt, clogged catalyst, etc. Now your vehicle runs on LPG which actually is a good thing. Much cheaper then gasoline fuel. I am not familiar with LPG carburation methods, but backfires are pretty basic. Carb or exhaust fire, timing is a good direction and carb adjustment. I would do a compression test also. Check for a leak that is not allowing a full burn of the fuel in the chamber. Check vacuum lines also. If Timing the vehicle requires a short between 2 points, it must be done to show correctly the proper setting without advancing the timing. As long as the distributor has not been removed and placed a tooth off which is rare, but jumped timing belts will set a tooth off occasionally. Do a compression test, it will let you know your engines condition accurately.