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  1. R

    2003 Rubicon with P1391 code

    I am at a loss as is my mechanic Golen Stoker 4.6 with about 8,000 miles. Had a bad exhaust gasket and was misfiring on 2 and 5. that was fixed and jeep ran fine for 6 months Then I had a broken value spring on Cyl 5 - Repaired that Next at about 3,000 rpm the jeep would throw misfire on Cyl...