hi all have just brought a discovery with lpg , when i switch it over to gas it will run a bit lumpy for a few seconds then switch back over to the dear stuff. All the led lights are indicating full tanks, help please !!!!!!!!!!!

Could be the valve on the tank not opening or the valve on the reducer /mixer
maybe the reducer /mixer is not warm enough to vaporise the LPG check the coolant flow and the level in the system
your best bet is to take a look at the LPG Discussion Forum there are loads of experts there who will help point you in the right direction.
Log in and introduce yourself and type of system you have
Good luck