Since Peter 940 Turbo passed away I have not had and correspondence back from the owner.
My own T5 auto has exactly the same system fitted and by mistake I found out what the so called running issue was.
The problem was when you do the following.
Get in car (cold)
Start engine
Give it full throttle instantly.
Because the engine is still cold the high flow of LPG begins to freeze to vapouriser allowing liquid gas droplets to the injectors causing over fuelling resulting in a misfire. If you back off for a while and let the vapouriser recover then the problem goes away.
Solution
1) drive the car with a little bit of respect and let the engine warm up before booting it hard. Common sense and anyone into cars should know to do this for the sake of engine life.
2) If the driver is not capable of driving the car like a normal human then the change over temperature can be increased to allow the engine to warm up more before switching to LPG.
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