* Oil below $119 a barrel buoys sentiment
* Fed set to decide on rates, policy statement eyed
* Reading on vast U.S. services sector on tap
* Procter & Gamble beats estimates, but outlook weighs
(Updates with start of Fed meeting, adds ISM services index forecast, updates prices)
By Ellis Mnyandu
NEW YORK, Aug 5 (Reuters) - U.S. stocks headed for a higher open on Tuesday as a sharp slide in oil prices calmed inflation concerns and buoyed optimism that consumers and businesses would continue to spend, supporting profit growth.
U.S. crude oil futures <CLc1> slid nearly 2 percent to below $119 a barrel, a welcome boost as Federal Reserve policy-makers meet in Washington to decide interest-rate policy and give their assessment of the U.S. economy.
The health of the vast services sector will be in the spotlight when the Institute for Supply Management reports on its non-manufacturing index for July at 10 a.m. (1400 GMT).
Shares of energy-consuming sectors, including airlines and industrial companies, are likely be among the market's gainers, along with retailers' stocks if the decline in oil prices continues.
"Oil is a huge catalyst, along with a stronger dollar," said Matt McCall, president of Penn Financial Group in Denver, Colorado. "With energy prices going down, I see money coming into all the other areas of the market, including technology and financials."
S&P 500 futures <SPc1> rose 7.90 points and were above fair value, a formula that evaluates pricing taking into account interest rates, dividends and time to expiration on the contract.
Dow Jones industrial average futures <DJc1> were up 71 points and Nasdaq 100 <NDc1> climbed 14 points.
Shares of technology companies, which thrive on both consumer and corporate spending, will also be among the beneficiaries of falling oil prices, analysts said.
Apple Inc <AAPL.O>, a tech bellwether and the maker of the iPod and iPhone, rose 1.2 percent to $155.06 before the bell after UBS started the stock with a "buy" rating, according to theflyonthewall.com
Among financials, shares of Citigroup <C.N> , the largest U.S. bank, rose 2.2 percent, to $19.25 before the bell.
In earnings news, Procter & Gamble Co <PG.N> posted a stronger-than-expected fiscal fourth-quarter profit, but the consumer goods maker projected profit for the fiscal year begun July 1 that could trail the average Wall Street estimate. P&G shares were little changed before the opening bell.
The Fed is widely expected to keep interest rates unchanged at 2 percent, but investors will scrutinize its policy statement on signs of mounting price pressures and the impact on the economy. An announcement is expected around 2:15 p.m. (1815 GMT).
The ISM services index is forecast to show a median rise to 48.5 from 48.2 in June, according to a Reuters survey. (Editing by Kenneth Barry)