Thanks for that, I may have to bite the bullet and replace the MAF with a new one
I don't think the LPG is related as it currently has a fault, I'm running the car solely on petrol until I get all it's other issues ironed out - the petrol injectors are turned off when the LPG turns on, so I assume the petrol rail maintains running pressure all the time.
Where did you source your MAF from?
Cheers