Do a search on this forum as i posted picture about 6 months ago.
The idle issue most likely wont be caused by the vacume hoses.
1 loose bottom part of the carby -remove air cleaner and see if there is any movement of the carby. If so remove carby, turn it over and tighten the 3 large screws - refitt carby
2 - a crack in the exhaust pipe just below the flange or loose exhaust / exhaust leak - will also cause lack of power and back fire
3 - carby is gunked up and needs a rebuild - sometimes spraying carby cleaner into the carby has fixed theproblem. More commen if you are running lpg
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