I would imagine that dry gas = fuel additive, cleaner, gets rid of any water in the system, treatment. Like Barrymans, or the like. Is your 94 Wrangler fuel injected? If so, you may have some clogged injectors. I know you said you tried "dry gas", but have you run Barrymans fuel treatment? It will usually clean your injectors very well, if carburated, shoot some down the carb, it will clean it up real well. If you have an in-line fuel filter,which I am sure you do, try replacing that.