Hello there Calakas: can you find out what problem codes the vehicle has thrown? You mention she had the wrong plugs installed - what other incorrect components might there be in place? Have you tried to have the problem(s) diagnosed by the dealer or a good shop? I have no specific useful comments as I have no idea what's going on under your hood/bonnet....but, could your advance-less distributor be involved?
I like the way your LPG system seems to run leaner (brown plugs not black) than the stock petrol system as this might allow your exhaust valve stems to stay cleaner (this is a big problem with these engines in N. America)
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