I have to agree with Jack about the throttle body. Sounds like another case of Volvo dealer "stab in the dark" fault finding when it comes to LPG. I've come to the opinion that the computor diagnostics are not very revealing when it comes to LPG. So if it's just a question of using experience and guess work to cure the fault then I'd suggest a good independent has as much chance as a dealer and at a fraction of the cost!
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