I recommend anyone thinking of converting his or her car to LPG to think again. I converted a 2003 VY Commodore V6 and switched to LPG after being told by my dealer not to, and have had nothing but trouble ever since. Now running on petrol I don't have a problem, but I'm a few thousand dollars down the drain. I say stick with petrol; our cars were not designed to run on LPG.
It's unfortunate that you've had a bad experience with LPG, as your car is one that converts well and thousands of motorists have done it. But it is worthwhile talking to a number of converters and owners who have made the switch to get their first hand experience of any troubles they might have had.
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