Pajero on gas

I wish I had seen this site about 15 months ago when I had my 2001 Pajero Exceed converted to a dual fuel system. I have had nothing but trouble with the thing. The installation is fantastic and I think they have done a terrific job however from the moment we took ownership it has never been right. About a week after delivery it started playing up and had to return it as the computer for the gas iinstal became faulty and made the motor idle really rough and would not allow me to swap from gas to petrol. Sent it back and they changed the computer no problem. All was good for about a week or two when the thing started to idle so rough at traffic lights it almost stalled I kept perservering with it until 2 huge backfires which destroyed my air intake box at a cost of $530. Took it back to check the tuning and stuff and found nothing wrong except they said the oiler was empty which I found hard to believe as I had checked it the day before. I am now at a stage where my wife and I are so worried about using the gas we have decided to run on petrol. The system that we had installed was an Airod system which Im sure works very well in other types of cars (As it does in my sons 1992 Ford Fairmount) But is completely unsuitable in my car. We have now decided to pay an extra $3000 and have the direct injected version put in so I will keep you posted. Looking forward to see if the economy will be any different as I think 25 Ltr / 100 KM is a bit steep