Check engine light after reving to 4 grand -
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post #1 of 1 Old 10-02-2012, 09:22 AM Thread Starter
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Check engine light after reving to 4 grand

My 97 jeep wrangler sport displays check engine light after about 4000 RPM with random misfire codes. I think the valve springs are weak. Anyone have this problem??? Ohh its a 4.0L

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