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It appears that you may be suffering from the same problem i had a while back. Have you checked the wires to the alternator or even the plugs because the rev counter on a lot of cars runs of the alternator. Or it could be the alternator on the way out.

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โˆ™ 2015-07-17 17:41:27
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Q: Why do the rpms suddenly drop to 0 when driving on the highway?
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What is the normal RPM range driving at highway speeds for a 1994 Jeep Grand Cherokee SE?

2-3 rpms


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Why does your car lose RPM when driving?

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Why does a 1983 Monte Carlo with 305 eng loose RPMs when the air conditioner comes on?

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