Stocks Drop as J J, Energy Shares Weigh  NEW YORK (Reuters) - Stocks tumbled on Tuesday as oil  prices hit a 3-month low, hurting energy companies, and   Johnson   Johnson &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=JNJ.N target=/stocks/quickinfo/fullquote"&gt;JNJ.N&lt;/A&gt; slipped on a report it may be  planning a major acquisition of a medical device maker.