* U.S. stocks slide on worries about new Fed program
* Oil falls more than $3 as optimism dims over Fed plan
* Debt prices rise on gloomy U.S. GDP data, Fed program (Recasts with U.S. markets, adds byline; dateline previously LONDON)
By Herbert Lash
NEW YORK, Nov 25 (Reuters) - U.S. stocks fell and bonds rallied on Tuesday on worries that a massive new program from the Federal Reserve won't be enough to shore up the faltering U.S. economy.
Oil fell more than 6 percent to $51 a barrel, unraveling a near 10 percent rally the previous session, as optimism faded over the government's bailout of Citigroup on Monday and the Fed's latest move to ease seized-up credit markets.
The dollar fell for a third day against the euro after a Commerce Department report showed the U.S. economy contracted in the third quarter at its fastest pace in seven years as consumer spending plunged to a 28-year low.
The report sent spending-dependent technology shares lower, cementing expectations that the Fed would again cut its benchmark overnight lending rate when policy-makers meet next month.
The Federal Reserve on Tuesday announced two new programs aimed at making it easier for consumers to obtain loans for homes, cars and on credit cards. It will buy up to $100 billion of debt issued by home funding companies Fannie Mae and Freddie Mac and the Federal Home Loan Banks, as well as buying up to $500 billion of mortgage securities backed by Fannie Mae, Freddie Mac and Ginnie Mae. It also launched a $200 billion facility to support consumer finance.
Economists and analysts applauded the government efforts to boost consumer loans, but on reflection, after yet another massive multi-billion-dollar program, investors wondered how much more money is needed to stem the financial crisis.
"Longer term, I think it's a bit disconcerting that the Fed continues to try to get ahead of this. Every time they stop one leak, they have to move to the next one," said Tom Alexander, head of Alexander Trading in Savannah, Georgia.
"That's the question in the minds of not only market participants but the guy on the street: What is going to happen?" Alexander said.
The tech-rich Nasdaq fell more than 2 percent as worries about the deepening global slump drove a sell-off in big-cap technology shares. BlackBerry-maker Research In Motion <RIMM.O> fell 10.6 percent and Apple <AAPL.O> fell 4.1 percent.
In another disconcerting development on the tech front, analysts at UBS said network equipment maker Cisco <CSCO.O> is planning a four-day shutdown to cut costs as it faces "soft" demand. Cisco slid 6.3 percent.
After 1 p.m., the Dow Jones industrial average <
> was down 85.55 points, or 1.01 percent, at 8,357.84. The Standard & Poor's 500 Index <.SPX> shed 6.77 points, or 0.79 percent, at 845.04. The Nasdaq Composite Index < > fell 26.40 points, or 1.79 percent, at 1,445.62.European shares eked out a gain as rising bank and energy stocks offset declines in autos and drugmakers and a slide in miner Rio Tinto after BHP Billiton dumped its bid.
The FTSEurofirst 300 <
> index of top European shares ended up 0.6 percent at 833.36 points.Darren Winder, head of macro and strategy research at Cazenove, said global efforts at getting economies back on their feet will slowly stabilize sentiment.
"Fundamentally markets are bumping along the bottom with high levels of volatility, and that pattern will continue. Falls in profit haven't fully taken their course," he said.
Banks and energy stocks added the most points to the index, with HSBC <HSBA.L> gaining 6.1 percent and Credit Suisse <CSGN.VX> jumping 11.4 percent. BP <BP.L> added 1.5 percent and BG Group <BG.L> rose 4 percent.
Rio Tinto <RIO.L> plummeted 37 percent after BHP Billiton <BLT.L>, which rose 7.2 percent, abandoned its bid for the group.
Longer-dated euro zone government bond yields fell, tracking a steep fall in their U.S. peers, after the report on U.S. gross domestic product and a report showing single-family U.S. home prices plunged a record 17.4 percent in September from a year ago.
The benchmark 10-year U.S. Treasury note <US10YT=RR> rose 60/32 in price to yield 3.12 percent. The 2-year U.S. Treasury note <US2YT=RR> rose 5/32 in price to yield 1.18 percent.
The dollar fell against a basket of major currencies, with the U.S. Dollar Index <.DXY> off 0.67 percent at 85.14. Against the yen, the dollar <JPY=> fell 1.96 percent at 95.14.
U.S. light sweet crude oil <CLc1> fell $3.37 to $51.13 a barrel, as the bleak U.S. economic data renewed worries about the outlook for demand.
Spot gold prices <XAU=> fell $3.60 to $815.95 an ounce.
Before the Federal Reserve unveiled effort to support the U.S. financial system, Asian shares rallied and bonds fell overnight after the U.S. government rescued Citigroup.
Japan's Nikkei average <
> jumped 5.2 percent, resuming trade after a public holiday, and MSCI's index of Asia-Pacific stocks excluding Japan <.MIAPJ0000PUS> rose 3.8 percent. (Reporting by Leah Schnurr, John Parry, Vivianne Rodrigues in New York and Ian Chua, Jane Merriman, Sitaraman Shankar and Jan Harvey in London; writing by Herbert Lash; Editing by Leslie Adler)