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    Troublesome 2002 4.0, hitting brick wall at 4200rpm

    Long story short, she's been a troublesome truck. If grandma drove this truck lightly, she'd never know there were any problems, it's only under high rpm.. 2002 Explorer (non sport) 4.0, about 145k. Symptoms: NO high rpm power, tapers off till about 4200 rpm tops. If you floor it and hold...
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