G'day and welcome!
I'm no expert so ill leave the diagnosis alone, however I can point you to the OBDII port! There are a few posts here regarding rough running issues and LPG dramas. Have you tried the search function? If you scroll down a few topics (and maybe onto the next page) I'm sure you will find something of help.
It is up under the dash in the LH (passenger) footwell.


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or tell him that you'll try and help but really...he needs to do a bit of research and fix it himself

). As I said, he's made it available for free and it is accompanied with numerous Youtube clips demonstrating how it can be used.
Looking forward to further posts from you/son!!

I might get an L322 though. 

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