Have you tried the ignition key cycle, if you have any engine fault codes they will be displayed in the instrument cluster display where the odometer mileage is usually shown.
Google tj fault code, it's something like start with key off, cycle on to off twice and then end with key on and wait......
No codes in history your display will show "done".
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2004 TJ, 4.0L, Manual, finally reliable and fun.
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