Hi,  My Astra has started cutting out on change over to LPG.  If I am 
driving I lose all power, for about 6-10 seconds and it feels like the 
engine has stalled, but the revs are still kept up(i guess by the car 
moving) then the power is back.  If I leave it idle, I just stalls, I have 
even tried holding it at 2500-3000 revs to see if that keeps it but as soon 
as I hear the click of the relay changing it to gas it just dies.  It has 
recently had a full service and new filters,  any ideas?