Hi there.
not sure if this link will help you out but have a look.
1991 Jeep Wrangler stall and die Google Search
SOURCE: Jeep Wrangler Gas Consumption and Loss Of Power
If its using a lot more fuel than usual its almost garaunteed an 02 Sensor. Those are located on the Exhaust Manifold's, are about the size of your thumb, and generally have 2, or 3 wires coming from them. If you can, check them for operation before you replace them as sometimes they're kindof expensive.
SOURCE: hesitation, stalling like out of gas
Clogged Catalytic Converter. What happens is as you push down harder on the accelerator you force more gas into the system causing a slightly richer mixture and more exhaust flow is neccessary. The easiest way to look for a clogged cat is when it's dark out take it for a ride causing it perform it's problem look under the vehicle if the cat is literally glowing red hot you either have a clogged cat or an extremely rich fuel mixture.
SOURCE: Jeep GCL Backfires Stalls
Aaron, I had the same problem. It is the most expensive part of course the computer. I replaced everything as well till I replaced it. They are remanufactured and have had problems with them as well. I am on my third one now at 200k miles. Oh and by the way it does not show up on the diagnostic check. Good luck
Frank
SOURCE: 1995 Jeep Wrangler 2.5 4cyl spits and sputters while driving
have you considered checking alternator and battery? just a thought
SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies
you check for miss how is compression
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