ok since you do have diagnozer, set the communication settings for VCM1 to ECM, go to the input monitor tab, watch the LPG fuel pressures, they should run in the range of about 5000 (a little less or more)
if the ranges are higher then it is running too lean, if lower its too rich, if it is fluctuating badly it probably is an injector problem.
Also pay attention to the pedal position and throttle sensor readings
at full throttle they both should go to 100%. Any fluctuations in those readings will indicate a problem.
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