A bevy of economic reports, including durable goods orders, will grab attention, particularly after the Federal Reserve unveiled its plan on September 13 for a third round of aggressive stimulus to help revive the flagging U.S. economy.

While the action ignited a rally in stocks, analysts have worried that it may suggest the U.S. economy is in worse shape than many had feared.

To be sure, stocks are at lofty levels and are likely to attract investors hoping the market will ride out the year on a positive note. The Dow Jones industrial average .DJI and the benchmark Standard & Poor's 500 index .SPX.INX remain close to highs not seen since December 2007. The S&P 500 is up 16.1 percent since the end of 2011.

"I think the market certainly is ripe for a pullback. But whatever the pullback, it's going to be rather shallow," said Peter Cardillo, chief market economist at Rockwell Global Capital, in New York.

"Any disappointment in key economic data that would reverse the market's feeling the economy has stabilized, I think could trigger a 2 to 4 percent pullback," he added.

Some of that move was seen this week in stocks, which posted slight losses for the week. The S&P 500 slipped 0.4 percent for the week. The Dow industrials and the Nasdaq each finished the week down 0.1 percent.

Besides August durable goods orders, data on personal income and spending is due next week, as well as new home sales and the final read on U.S. Gross Domestic Product for the second quarter.

Housing data has been surprisingly strong in recent months and homebuilder shares have experienced massive gains. The PHLX housing sector index .HGX is up 62.3 percent since December 31. But that strength has been offset by worrisome data on U.S. manufacturing, which had been among the economy's strongest sectors. The stubbornly high U.S. unemployment rate also has kept a damper on Wall Street's mood.

THIRD-QUARTER GLOOM AND DOOM

Profit warnings from such high-profile U.S. companies as FedEx (FDX.N) helped cement the view this week that third-quarter results could be a drag on the market.

"We've had some pretty negative pre-announcements, and those announcements for this time frame have been a little more than we've had in the past," Cardillo said.

Estimates for S&P 500 companies' third-quarter profits have fallen sharply in recent months, and earnings now are expected to drop 2.2 percent from a year ago, according to Thomson Reuters data. It would be the first such decline in three years.

Outlooks for the third quarter are at the most negative since the third quarter of 2001, the data also showed. The negative-to-positive ratio for the upcoming earnings period stands at 4.3 to 1.

Third-quarter earnings aren't expected to start in earnest until after the second week of October, when Alcoa (AA.N) is expected to kick off the reporting period.

"What I'm worried about is what I don't know," said Doug Cote, chief market strategist at ING Investment Management, in New York.

That includes negative surprises on earnings, he said, as well as the chance that China's economy may be slowing faster than economists previously thought.

"The aggressiveness of the (Fed's) quantitative easing has caused me alarm," Cote said.

FLOOR FOR THE MARKET

The Fed's recent action followed a decision by the European Central Bank to support debt-ridden euro-zone nations by purchasing their debt.

Speculation on Friday that Spain was moving toward a bailout request gave investors some relief. The debt-laden country, which is likely to stay in focus next week, said it was considering freezing pensions and speeding up a planned rise in the retirement age as it raced to cut spending and meet conditions of an expected international sovereign aid package.

Both central bank moves are expected to provide a floor for the market, possibly through year end, analysts said.

"Financial markets will benefit more than the economy," said Fred Dickson, chief market strategist at D.A. Davidson & Co., in Lake Oswego, Oregon.

With the Fed's decision out of the way, investors are also likely to turn their attention to other issues, including November's U.S. presidential election, he said, and looming decisions about U.S. fiscal policy.

(Wall St Week Ahead runs every Friday. Questions or comments on this column can be emailed to: caroline.valetkevitch(at)thomsonreuters.com)

(Editing by Jan Paschal)

• A Permanent Economic Emergency