US Stocks Up Slightly After Ford Forecast  NEW YORK (Reuters) - U.S. blue chips edged higher on   Friday after Ford Motor Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=F.N target=/stocks/quickinfo/fullquote"&gt;F.N&lt;/A&gt; raised its earnings  forecasts, but wireless technology provider Qualcomm Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=QCOM.O target=/stocks/quickinfo/fullquote"&gt;QCOM.O&lt;/A&gt; held back the Nasdaq after saying an accounting review  may reduce pretax income.  