DTC 244 - Adaptive Learn Low (LPG)
Circuit Description
The heated oxygen sensor (HO2S) is used to determine if the fuel flow to the engine is correct by measuring the oxygen content in the exhaust gas. The ECM uses this information to correct the fuel flow with the closed loop multiplier and adaptive multiplier.

This fault will set if the adaptive multiplier exceeds the limits of normal operation.

Conditions for Setting the DTC
- Heated oxygen sensor.
- Check condition - engine running.
- Fault condition - adaptive multiplier out of range (at limit of -30 percent).
- MIL - on during active fault.

Diagnostic Aids
Always diagnose any other ECM codes that are present before beginning this diagnostic procedure.

Fuel system - high secondary fuel pressure will cause the system to run rich. A worn fuel mixer, faulty pressure trim valve (PTV) or fuel trim valve (FTV) can also cause the system to run rich.
Fuel quality - a drastic variation in fuel quality (very high butane content) may cause the system to run rich. Be sure that the specified HD- 5 or HD-10 motor fuel grade propane is used.

I think i would try cleaning the mixer and draining regulator first
it would help if you had the pc program so you could monitor the O2 sensor and fuel pressure etc.
But all in all if your cleaning doesn't improve things it may be the O2 sensor. (just guessing of course)