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    2003 4.0 SOHC Explorer problem - timing chain(s)?

    We have an '03 with 128K on it, went through a toll gate and no acceleration after, ran like crap. Made it to next exit, stalled and wouldn't restart. Rode flat bed of shame home. No breathing through engine 15# back pressure, cats totally clogged. Replaced Y-pipe and cats. Now runs, but...
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