Take it back to the installer to have a look. Did they advance the timing to run on gas, it needs advancing , usually to 10deg TDC.
Did they gap the plugs correctly, or are your plugs leads old. LPG needs a healthier spark as it is a different octane than petrol.
There is some power loss on the ordinary gas systems, but the ignitionb system with show up more probs' than it does with petrol


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