Jaguar XJ6 1980 Problems

BY LAW you're required to bring the car to a halt when you switch between gas and petrol, or vice versa. That's to avoid the potentially dangerous situation of losing power when switching on the road. In any case it's not advisable to be fiddling with switches while driving. Apart from that, the only other thing to do is to not have your foot on the accelerator as you switch over.