While the stock market generally goes up over time -- due mainly to rising sales and earnings of businesses -- there are some companies that are best kept out of one's portfolio. That's particularly true if one is trying to outperform the broader indexes over the long term.

There's one business whose shares have done relatively well recently, up 18% in just the past six months. But this auto stock has been a disappointment over much longer periods of time.

Continue reading to find out which company I wouldn't touch with a 10-foot pole. Perhaps you'll feel the same way, too.

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Source Fool.com