Burned by weak earnings

NEW YORK (CNNMoney.com) -- Stocks fell Tuesday as investors digested disappointing results from Texas Instruments, American Express and DuPont and a report that a GM subsidiary was having trouble borrowing money for its sale to private equity firms.

The Dow Jones industrial average (down 91.61 to 13,851.81, Charts) slid about 0.4 percent in morning trading after sinking as much as 121 points near the opening bell. The broader S&P 500 (Charts) lost 0.5 percent, while the tech-fueled Nasdaq (Charts) sank about 0.6 percent.

Stocks rebounded Monday, with the 30-share Dow industrials jumping nearly 100 points on positive earnings news, after tumbling 150 on Friday.

Texas Instruments (Charts, Fortune 500) reported disappointing results after the market close Monday, which dragged on tech stocks. The chipmaker said weak demand contributed to lower quarterly profit and sales, sending shares down nearly 4 percent.

"What we've seen is when we have a household name that disappoints there tends to be a ripple effect," said Art Hogan, chief market analyst at Jefferies & Co. "TI touches a lot in technology."

American Express (down $1.81 to $62.85, Charts, Fortune 500) tumbled nearly 4 percent after disappointing investors with its revenue numbers reported after the market closed on Monday.

Citigroup (down $0.78 to $50.08, Charts, Fortune 500) fell about 2 percent as NYSE Regulation reported that it fined the broker's Smith Barney arm $50 million for improper trading practices.

There were mixed results from three Dow components Tuesday as telecom AT&T (Charts, Fortune 500) beat forecasts and fast food leader McDonald's (Charts, Fortune 500) met expectations. Chemical maker DuPont (Charts, Fortune 500) fell short of estimates, falling 4.5 percent in morning trading.

Also weighing on the market: A report in the Wall Street Journal that said General Motors' (Charts, Fortune 500) Allison unit is having trouble selling debt to pay for its leveraged buyout by private equity firms, sending GM's stock down 1.1 percent.

Treasury prices eased in early trading, lifting the yield on the 10-year note to 4.97 percent from 4.95 percent late Monday.

The dollar fell against the euro and the yen.

Oil prices sank, with U.S. light crude down $1.71 to $73.18 a barrel on the New York Mercantile Exchange.

Market breadth was negative. Decliners beat advancers 5 to 1 on the New York Stock Exchange on volume of 360,000 shares. Losers beat winners on the Nasdaq 3 to 1 on volume of 500,000 shares.

Major Asian markets finished the session lower, and European stocks dipped early on.