Ok... well it seems that the misfire comes and goes, because when I went out to go and fix it, it was nowhere near as pronounced as it was earlier today.
I tried:
swapping injector coils on cylinders 1 and 2 - made no difference
swapping hoses on cylinders 1 and 2 - might have made a little bit of difference
swapping and checking gap on spark plugs on cylinders 1 and 2 - might have made a bit of difference.
It seems to be a smoother now, earlier on it was a definite miss as if one of the plug wires was missing. I guess I'm going to have to wait and see if the problem resurfaces tomorrow. At the moment it does seem like cylinder 1 is getting a weaker spark than the other 3 cylinders and its working on petrol but sneezing on lpg.
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