Some details on the system might help
At the moment there are lots of heavy ends in some LPG supplies as it is reused LPG that has been used as a chemical scrubber. It is ok for heating etc but not good for running engines. The vapouriser and injectors might need a clean out
Air leaks, has a smoke test been done? Any air leaks will cause a lot more issues on LPG than they will on petrol
Spark plugs, what plugs are you running? You want to be on NGK or Denso single prong plugs.
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