I had the exact same problem with mine. After replacing nearly everything i took it to a shop today to learn that I had a bad wire on the back of the distributor and the new fuel pump i installed from autozone was faulty and not providing enough pressure.
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Try a little starting fluid in the intake (not too much, just enough to test). If it takes off for a second or so, may be water in gas. Ten months old? It should be alright, unless it's loaded with water.
If by "bad gas" you mean dirty or wet (water or alcohol), the fuel filter and/or lines may be clogged or holding water...or the injectors could be clogged with dirt.
Hearing the pump run doesn't mean that adequate pressure is reaching the engine...a fuel rail pressure tester will tell you if the pump and relay are doing their jobs properly.
Test for spark to rule out ignition circuits and module...Lay one plug wire near a good ground and have someone turn the key for a couple of seconds...you should see a long spark jump to ground. If no spark, the ignition module, distributor pickup, and crankshaft position sensor are the prime suspects.
> As a test ONLY, I would back out a plug and spray a short-shot of starter fluid into the cylinder, replace the plug (quickly...starter fluid evaporates pretty fast) and give a crank. If it sputters, it's definitely in the fuel delivery...and I would start with a fuel filter.
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was fuel pump changed and lines flushed---turn key on if fuel pump hums system should pressurize turn off and under hood check to see is gas is present in fuel line[have rag handy and press valve down at fuel test port which is in line between distributor and throttle body if no pressure filter clogged or pump not working -if fuel and water need to drain again -if fuel than need to test throttle body -spray some starter fluid into truck if starts or sputters than still have problem with fuel delivery --
I don't think an exhaust leak would cause the sputtering in all gears. I've run my Geo in the past with a cracked exhaust manifold for months, and it ran fine, just a bit louder. Are your spark plugs & wires in good shape (missing vs sputtering)? Also check inside the distributor cap for corrosion/carbon build up. If all that is ok, then I would start with the basics: first try running a complete fuel system cleaner through it for the next two tanks, that should clear any partially clogged fuel injectors. If no luck, then replace the fuel filter, and try it, if it still sputters you can check the fuel pump strainer if it looks ok, then you might want to replace the fuel pump.
if you have an electric fuel pump that would explain the hum. unhook your incoming fuel line and blow the line clear, sounds like you've got some junk in your tank.it'll build up on the screen in the tank then fall off (at least partially) when your making turns or hitting bumps or holes. next time it's only got a gallon or so of fuel i'd drop the tank and check the pickup tube inside. sux but that's the only way to get to it. while you've got the tank off and out from under the jeep, might as well clean it out real good and replace anything inside (usually the screen) that doesn't look right, dirty etc. wouldn't hurt to run a bottle of fuel system cleaner in the next full tank of fuel either. preferably as soon as you put your tank back. good luck