I Think The Vap is on its way out TD because it searches alittle Also now and again it stalls only when pulling up to an exit say of a motorway at speed as soon as you put your foot on the clutch the revs drop all the way down and then Stall but its only now and again and i have figured that if i leave pressing the clutch as late as poss ie if the car is nearly at stand still it never stalls.
I did some searches online and acouple of people said it was a Vap failing that causes this.
Oh and I think the backfire was caused by the LPG tank being very low Cough Cough forgot to fill it up again it can cause backfires if the LPG pressure is right down here is some info i found on it
With my System Being an old Mixer System I guess the below applys lol
As tank contents reduce it follows that tank pressure will reduce. That means less fuel gets to your vapouriser and ultimately to the engine. If allowed to get to a critical level, the fuel/ air mixture can become so 'weak' (not enough fuel mixed in the air inducted) that the engine may 'backfire' through the induction system, especially when the throttle is opened wide from a low setting. This can cause problems ranging from a simple 'popping' sound right through to a large bang and damage to air filter boxes, airflow meters and anything else in the induction system. Most LPG conversion specialists will fit an anti - blowback damage protector in the form of a one-way valve to cover any malfunction but this can only protect your system from minor backfire occurrences. If you let your LPG tank run right down to empty your chances of this happening increase a hundredfold and it won't be the fault of the installer or the equipment that was fitted for you. You may normally expect fair warning of low LPG tank contents from your vehicle as the engine may well become 'sluggish', especially during acceleration (much the same as running out of Petrol). If this happens, don't wait for it to stop altogether. Switch over to Petrol rightaway
Craig