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    Backfiring and losing power

    Bought 2000 Jeep TJ 2.5L 5 sp about 3 weeks ago. Drove 250 miles home, noticed slight miss, sputter in 4th and 5th under a load, but never backfired through intake or exhaust. Owner told me had a cracked exhaust manifold. Had a new one put on. Had codes P0131 and P0138 on check engine. Replaced...