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From my experience with my wife's 97 Wrangler look at the intake manifold for 2 vacuum lines. They will be just under the throttlebody One of them is broken or has come loose. We had this problem several times, idle high, running eratic, until I put a smaller rubber hose on the fitting. Has run good since.
sounds like it might have varnished gas in the system. I would change the fuel filter, clean out the lines with a good carb/fuel injector cleaner and fill the tank with fresh gas. I will run a little rough until the bad gas is run out. If this dont correct the problem then it might be in the fuel pump or fuel regulator areas.
Computers aren't ALWAYS correct. If a code wasn't cleared after the original problem, it will read the same codes off to the diagnostic. I would remove the wire connector to each injector while it's running. If one of them makes no difference THAT is your culprit. Let me know please!