After driving the car for about 10-15 mins, the lpg seems to just cut out. The car then wont start for a while even if i try starting it on petrol. I tryed driving it on just straight petrol for a couple of days, it also cut out but then the next day it was fine?!
Its had the rear tank solenoid changed and the lpg computer, could it be the lpg/petrol changeover switch?
Any ideas on what the problem is?
Thanks

Since it happens on both fuels, I'm assuming it's an ignition issue.
It's common for the distributor TFI to exhibit same fault - as engine heats up, TFI fails, then once cooled down, works fine again.

Is there a way of keeping it cool?

move it to a heat sink somewhere colder,inner guard close to dizzy.