First question.
Taxi Drivers emissions light keeps coming on, what do you do.
1) Ignore it
2) Take the bulb out
3) Take it to the dealer, and let him put yet another ECU on.
4) Get them to change the cam sensor
5) Your own idea to the problem.
Of course the real answer is to realise that the LPG controller is pretty basic and doesn't monitor emissions via both lambda sensors and hence the ECU, which is being fooled into thinking its in control but isn't, flags a code because the mixture is not spot on.
Am I the only one that doesn't understand a word of that!!
Gee thanks Mark 
Probably - mine doesn't monitor lamda and relies on car ECU to drive it, there is a carburation screen in RISN where you can adjust this - but I need a 100foot long serial cable!
However the carburation is a bit of a blunt instrument, I applied -24 or -25 to full load, full revs to orevent injector cut out, and this applies over more than full rev full throttle. As I said a bit blunt - really needs more than 8positions
Idle or out of idle x very low load or low load or middle load or hight* load
* Thats how it is spelt!