Has anyone experienced the same issue and I am having? My GU will backfire very loud under the bonnet, when running on gas, not all the time, sometimes when i give it plenty, other times under load. Lose power and not sure what its destroying. Cant run it on petrol at the moment as the previous owner had always ran on gas so the injectors are rooted i have only owned it for a month or so. Any help would be great!! cheers - pete.