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Lumpy Gas

Hi,
Can anyone help ?, my duel fuel 253 runs fine on petrol but on gas it is erratic, will start fine but cut out several times till warm then run OK while moving but stall at junctions, lights etc, (always restarts ! ). When hot idle is lumpy and take off a bit shaky, will run a hundred klicks no worries then stall at end ??, This is my first gas vehicle after driving and maintaining for 30 years and I know nothing of maintaining a gas set up.
Watching this space,

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i dunno i have a 173 does same sort of thing turned out that my spark was not strong enough due to old high tension leads since petrol ignites easier than gas when compressed the spark does not realy need to be as stong get a fatter coil and check spark plug gaps high tensions and maybee its running too rich aswell hope this helps dunno for sure if its the same problem as mine

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gas is a lot harder on plugs/points/condensers/leads. they have to be good.

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Gas likes to be around 2 - 4 degrees advanced timing
Gas likes Eagle High Tension Straigh gas leads (the best leads.. i mean the best. drag racing approved leads.)
Gas likes 1-up temp gauge plugs ie. go from NGK DB6FS to DB5FS
Gas likes the converter to be wax-free inside. clean out by squirting some carbie cleaner down the primer hole every morning before you drive. clean the wax out, or get it reco'd. (not $$$ at all.)
Gas doesn't like vacuum leaks. check your vacuum advance pipes.

Peace out.

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