Hi
I've had LPG fitted to my 99 Vectra 2.5 V6 for just under a year now and 
I've notice that accelerating or applying power at low revs is no longer 
smooth on LPG (fine on petrol), occasionally I get a quiet back fire if I 
persist on keeping the pedal to the floor (overtaking at 50mph in 5th gear 
instead of dropping a gear).

I have a feeling that one or more sparkplugs are not igniting the gas when 
in the cylinder, could it simply be that I need new sparkplugs or is it 
something more serious?

Thanks
Mark
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www.markdootson.co.uk