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Gas likes it advanced ,so just before it Pings on petrol would be spot on,
Most gas problems are electrical so make sure your leads are clean and in good nick.
Retarded it will sound like a flat...
Hi Jim, I think the car is tuned for petrol , So try moving the distributer to left or right after you start it on LPG and see if that make a difference, but be4 you move the dizzie Mark a set point...