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I recently started having problems with my 2000 Wrangler (with 95,000 miles).

1. Once engine reaches operating temperature, it starts stumbling and missing in 1st, 2nd and 3rd gears. After heating up good, it starts stumbling and missing in all gears and at highway driving speeds

2. Driving at 65 or 70 MPH, the tachometer and speedometer drop to zero and the red 'AIRBAG' indicator light comes on. After a mile or so, the guages return to normal and the red indicator light goes off

3. Occasionally when sitting at a stop, the engine revs up to 1,200 or 1,500 RPMs in 1st or Neutral. When I let off the clutch, the RPMs come back down to normal idle levels

Had a mechanic trying to fix the problem with no success--he suggested I take it to the dealership. Dealership says the problem is in the wiring--both engine harness wiring and dashboard wiring--and I must get all wiring replaced to solve the problems.

I have had no water damage or any other 'trauma' happen to my TJ that would damage the wiring. Is wiring really the issue? Is this typical for Jeeps?
 

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Is it giving any code? If so which ones?
 

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Sounds to be electrical, but one thing on your system that could cause all that and throw no codes is a bad computer. When it heats up it goes nuts. Its not definate I have seen 2 computers act crazy due to overheat. The only symtom that was the same between them was that neither ever threw a code.
Usually in shops when a computer is bad you will see a long list of things that were replaced and at the end of the list is the comp. Best way to check the harnesses is start the jeep let it warm up, and wiggle the harnesses or the suspected wireing to try to duplicate the problem in you driveway.
There is another way with a spray bottle filled with water but that one tends to shock anyone in the area. :)
 
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