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    Code P1121 - Help

    I have a 2002 Explorer Sport Trac (4.0). I had a code for p1120 (faulty TPS) about a month ago. Replaced w/ aftermarket TPS; everything was fine. About a week ago, same code. I take the TPS off, exchange it under warranty, but it changes nothing. So, I take it to a shop for further...
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