Hi Adam,

Thanks for that. The Co2 at idle looks a little low for a cat equipped car. The Co2 at fast idle is far too low and Hc way too high. I am assuming the misfire is both on petrol and Lpg. Special plugs? Is there such a thing for lpg and petrol? Never heard of that. Think I would want to put proper plugs in and see how that goes.

From my balcony drinking a cold beer in the Philippines, I suspect valve problems which I have heard can be caused by using Lpg.

But unless the plugs are approved by Vauxhall, I would change them first.

Best of luck.

Pete M