Hi I have a 2003 vy v6 non supercharge commy recently i was driving it nd it just turned of there was a lota smoke comming from the engine and the water cap was lose when i opned the bonnet ithink the headgaskits gone its got lpg on it aswell i was wondering if i can do the replacement of the headgaskit at home as i have a bit of experience i was a mechanic about 9 years ago so m not upto date with lpg repairs any help would be appricated thanks