I suspect an Air/Fuel Ratio problem. You should be able to check using the O2 sensors and an OBD/CAN monitor *to log O2s while driving.
You have a lot less energy/volume with LPG than you do with gasoline which means you will have less power. But, when properly adjusted, it should run and rev up smoothly (if not quite as fast as with gasoline).
*edit
Last edited by SouthArk370Z; 10-19-2014 at 05:04 PM.
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