Can you locate the point of the hissing? I'm thinking either a vacuum leak or if you stop it on a compression stroke you are hearing the compression bleed off. It could even be a partially burnt air/fuel mix bleeding down.
Do a compression check on it, and then verify that carb is getting plenty of fuel. A little fuel in the carb make it run easily? Has it been sitting for a long time? Maybe needs the carb redone.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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