Stocks Fall as Intel Update Awaited  NEW YORK (Reuters) - Stocks fell on Tuesday as a sharp drop  in U.S. consumer confidence in August stirred fresh doubt about  the economy and analysts lowered revenue forecasts for  technology bellwether Intel Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=INTC.O target=/stocks/quickinfo/fullquote"&gt;INTC.O&lt;/A&gt;