I would start by checking to see what code the unit has, assuming the check engine light is on. To check, find the 6 pin diag connector and jump the bottom left and bottom middle pins. Check engine light on dash will blink code. There will be a 2 sec pause between codes. 1: afr error (LPG) 2: afr error (gas) 3: vacuum sensor error 4: coolant temp sensor error 5: gas/lpg switching error
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