2000 XJ

I am having an odd issue? While sitting at an idle either in park or in gear the idle will be around 750, and then all of a sudden it wil jump to 1000 and idle just fine however when I depress the accelerator it will sputter and almost stop running or just stop. It restarts and runs just fine until the next time. It's been very random. Any help would be appreciated. Thank you in advance.

Any check engine light? If you've seen one (even if it isn't currently on), then retrieve codes for clues and post the EXACT code here.

Otherwise, I would recommend you try this procedure.
--------------------------------------------------
The Idle Air Control (IAC) is mounted on the back of the throttle body. (front for 87-90) The valve controls the idle speed of the engine by controlling the amount of air flowing through the air control passage. It consists of a stepper motor that moves a pintle shaped plunger in and out of the air control passage. When the valve plunger is moved in, the air control passage flows more air which raises the idle speed. When the valve plunger is moved out, the air control passage flows less air which lowers the idle speed. Over time and miles, the IAC can get carboned up which can have an adverse affect on idle quality. Cleaning the IAC may restore proper function and is an easy procedure to perform and good preventive maintenance so it is never a bad idea.

CLEANING THE JEEP 4.0 IDLE AIR CONTROL

Remove the air filter cover, associated hoses and the rubber boot that goes from the air filter cover to the throttle body. Remove the IAC with a torx driver (2 bolts; one can be kind of hard to get to)

“Gently” wiggle out the IAC from the throttle body. Gasket on the IAC can be re-used if it is not damaged

Clean the IAC with a spray can of throttle body cleaner; inexpensive and available at any place that sells auto parts. Throttle body cleaner is recommended rather than carburetor cleaner as it is less harsh, safe for throttle body coatings and is best for this task. Use cleaner, a rag and a toothbrush and or Q-Tips. Be gentle; don’t twist or pull on the pintle that protrudes from the IAC as it is fragile and you could damage it.

Thoroughly spray clean and flush where the IAC seats in the throttle body with the same spray cleaner

It is also a good idea to clean the entire throttle body itself, the butterfly valve inside of the throttle body and all associated linkage as long as you have things disassembled

Reinstall IAC and check idle quality

I apologize I forgot to pull the codes. However I've already performed the throttle body cleaning procedure about two weeks ago. I'll pull the codes and post them shortly.

Yup, it's all about the codes. Gotta use the technology provided to you by your Jeep.

OBDII isn't perfect, but it is awfully darn good at pointing you to the offending circuit.

Codes are as follows P0305, P0351, P0352, P0353.