Well my friendly LPG installer has given me some great service and we are on the way to tracking down the issue. We have eliminated the spark plug issue so far i.e. replacing all the plugs. We have diagnosed the engine misfire on cylinder one for definite. He simply swapped over the engine coils ! from cylinder 1 and cylinder 2. So we still have a misfire on cylinder 1 even though we swapped over the coils which hold the spark plugs.
Basically cars used to have distributors and leads and spark plugs - now they have coils and spark plugs and electronics etc. seems like loads has changed since I used to poke around under the bonnet of my 1000 cc run around at uni.
Next step - we will replace the gas injector on cylinder 1 and see if that helps things. he reckons this will be a 45 min job.
I'll let you know how we get on.
