HELP !!!!!!

[CHEF_GOLF]

I have a landcruiser amazon 4.7 with an LPG conversation
It's running lumpy on tick over on petrol which when on LPG is amplified. On petrol it runs lumpy on tick over. On LPG it hesitates when setting off once warm. I have had the ignition coils replaced, ht leads and spark plugs.
The manifold requires a new gasket on the left hand bank. Any ideas

[PugwasHDJ80]

www.landcruiser.net

coupld of guys on there have lpg'd 100 series. Do you have any mayonnaise in the header tank? could be head gasket failure (easy to hide on an 8 cylinder engine if only 1 head has compression problems)

Exhaust manifold cracking problems also sound commonplace!

[CHEF_GOLF]

Cheers, no mayo in the water. But I have a leak on the manifold which I have had for the lasts 2 years but hasn't caused a problem before, but have ordered some updated manifold gaskets and am going to change the centre section which has a little bit of a blow