1994 Jeep Wrangler hard to keep running

hi there.
not sure if this link will help you out but have a look.
1991 Jeep Wrangler stall and die Google Search

Check for vacuum leaks with a can of throttle body cleaner spray it when the engine is running if u get a high ideal when you hit a hose you found it if not check your ECM. It could be going bad

replace the fuel pump,the check valve that holds pressure on the fuel is in the fuel pump.The fuel in the lines is draining back into the tank

It may be piston slap. This is caused by either engine wear with the piston bores being too large for the pistons, or by poor manufacturing tolerances, or a combination of both.

To test for this, start the engine up first thing in the morning and run it for about thirty seconds while you listen carefully and memorise the sound and intensity. Turn the engine off quickly, remove the spark plugs and put two squirts of motor oil into each cylinder. Reinstall the plugs, start the engine up again and listen. If you have piston slap the noise will have been greatly reduced or even eliminated for about thirty seconds seconds and then returns.

The fix is to rebuild or replace the engine, but if it works just fine then don't worry. Many slappy engines keep going for tens of thousands more mile. The fact that your knocking is only at idle suggests your crankshaft is not to blame.

1. check for vaccuum leaks.
2. check for a check engine code
3. check the throttle body/butterfly plate for carbon build up.

It is most likely from that actually. You may need to adjust the air / fuel mixture after modding the intake. Sounds like its getting too much air.

I'm not sure if your Jeep has this or not, but you could check with your local Chrysler dealership. Some vehicles have a sock filter in the gas tank to filter any debris before it is delivered to the engine. What sometimes will happen is, you vehicle will start and run until debris clogs the sock filter and it will die. After the vacuum on the fuel line is gone the debris will fall free from the sock filter back to the bottom of the gas tank. Then when you restart the vehicle it picks up the debris again and clogs you filter again. This happen to me once and I have to remove the tank and clean the debris out and install a new sock filter. Good luck.

check idle control valve mounting hardware & electrical connection on tbi. do not over torque bolts.

Check the fuel system, chenge fuel filter. clean the fuel tank.