It all means that the risk of a recession has increased, economic forecasters say.
The latest look-ahead from the National Association for Business Economics says the gross domestic product is on track to expand at just a 1.5 percent pace from October through December. If that proves correct, it would mark a sizable decline from the July-September rate of 3.9 percent.
The group's new fourth-quarter projection compared with September's prediction of a 2.5 percent growth rate. The GDP - the value of all goods and services produced in the United States- is considered the best barometer of the country's economic fitness.
For all of this year, the forecasters expect the economy to grow by 2.1 percent, which would be the weakest showing since 2002. Back then, the economy was emerging from a recession and grew by just 1.6 percent.
The association downgraded its growth forecast for next year - putting it at 2.5 percent, compared with an earlier projection of 2.8 percent.
"While the U.S. economy faces a higher risk of recession from credit markets, housing and energy prices, NABE's panelists still do not see recession as the most likely outcome," said Ellen Hughes-Cromwick, the group's president and chief economist at Ford Motor Co.
Federal Reserve Chairman Ben Bernanke, in a recent congressional appearance, put Wall Street, Main Street and politicians on notice that the economy was in for period of lethargy. He said economic growth would "slow noticeably" in the final quarter of this year and was seen as "remaining sluggish" during the first part of 2008.
In the NABE survey, about three-fifths of the forecasters put the odds of recession starting over the next year at less than one-in-three. About one-in-five sees the risk at greater than 50 percent.
"Spillovers from housing weakness to broader consumer spending, along with credit-market tightening, are seen as the most likely recession triggers," the report said.
By a rough rule of thumb, a recession occurs if there are two consecutive quarters when the economy shrinks. The National Bureau of Economic Research, the recognized arbiters for dating recessions, uses a more complicated formula that takes into account such factors as employment and income growth.
At present the overriding worry is that consumers will cut back sharply, sending the economy into a tailspin. The danger is that the severe housing slump, weaker home values and harder-to-get credit, and other problems could spook consumers.
The Fed lowered a key interest rate in September by one-half of a percentage point, the first cut in more than four years. The Fed followed with a quarter-point cut in late October, lowering the key rate to 4.5 percent.
At that time, policymakers hinted that the two cuts may be all that is needed to energize the economy and help it survive the fallout from the troubled housing and credit markets. The Fed's final meeting of the year is Dec. 11.
For the most part, NABE forecasters see the Fed's key rate staying at 4.5 percent through the rest of this year and next year. But some forecasters said weaker growth or further problems in the credit markets could mean more rate cuts, perhaps to 3.5 percent by the end of 2008. Others experts believe the rate could edge up next year to ward off inflation.
Forecasters expect consumer prices to rise 2.8 percent this year and then moderate to 2.5 percent next year.
The wild card in the outlook is oil prices.
Oil hit a record $98.62 a barrel last week. Gasoline prices have climbed above $3 a gallon. If high oil prices force lots of companies in other industries to raise prices, inflation could spread through the economy. If high energy prices chill consumer spending, it would further chill growth.
NABE forecasters, hope the worst is over for oil prices, and predict declines to $75 a barrel and $2.72 a gallon by the end of next year. The survey of 50 forecasters was taken from Oct. 22 through Nov. 6.
Even with the housing and credit problems, employment has stayed in pretty good shape. Forecasters predict the unemployment rate will remain at 4.6 percent this year. If that happens, it would match last year's rate, a six-year low. The experts believe the rate will climb to 4.9 percent in 2008, still considered low by historical standards.