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You have a PCM that going bad. Replace it. You can get it for less than $250 from eBay.

AnswerHave your battery checked. It could be going bad. When the Volt o meter spikes it is usually cause the alternator is trying its hardest to charge the battery and it just isn't taking any charge. This is a common thing. Of course it could always be something else, but this is the usual problem. Good luck. Brad.
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Q: 99 jeep Cherokee sport volt gauge spikes full and turn it off and its fine what could it be?
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