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Unread 10-02-2012, 08:22 AM   #1
Moparfreud
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Join Date: Oct 2012
Location: Hammond, Indiana
Posts: 3
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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