UPDATE 3-Jacobs cuts 2009 profit view; shares fall

* Q2 EPS 88 cents vs 80 cts year ago; meets expectations

* Cuts fiscal 2009 profit view on market uncertainty

* Shares down 10 percent

* CEO sees gov't stimulus impact on infrastructure in 2010 (Adds executive comments on outlook, jobs; updates shares)

SAN FRANCISCO, April 28 (Reuters) - U.S. construction services company Jacobs Engineering Group Inc (JEC.N: Quote, Profile, Research) posted a higher quarterly profit, but cut its full-year outlook and its shares tumbled 10 percent.

Jacobs slashed its earnings estimate to a range of $3.10 to $3.50 a share from a prior forecast of $3.55 to $3.90, due to pressure on margins and an anticipated weakness in revenue, executives said.

"While we viewed a downward revision in 2009 guidance as likely on energy markets pressure, we are slightly surprised by the extent of the cut," Keybanc Capital Markets analyst Tahira Afzal said in a note.

In afternoon trading, the shares of Jacobs, the second-largest listed U.S. company in its sector, fell more than 10 percent to $40.98 on the New York Stock Exchange, near their lowest for three weeks.

The shares of larger rival Fluor Corp (FLR.N: Quote, Profile, Research) were down 2.6 percent at $39.02.