Stocks slump slightly after plunge

NEW YORK -- U.S. stocks slumped Wednesday after a morning rally evaporated, but the losses on Wall Street weren't as bad as the manic moves that wracked markets worldwide over the last week. The S&P 500 slipped 0.8% after an earlier jump of 1.7% petered out. The Dow Jones Industrial Average fell 234 points, or 0.6%, while the Nasdaq composite dropped 1%. Stocks swung lower as Nvidia, one of Wall Street's most influential companies, went from a morning gain of 4.4% and pushing strongly upward on the S&P 500 to...