When was the air filter changed last.  Try pulling the filter and see
how the engine runs.

In article
<1108906952.923563.307260@g14g2000cwa.googlegroups.com>,

A dyeing fuel pump can act up in many different ways.
Sometimes, they just quit outright, other times, the engine may
exhibit hard starting symptoms a few times before they totally
die. Sometimes, all that is noticed is a loss of power or flat
acceleration, sometimes it's excessive noise before they totally
quit.
A fuel pump -has- to output more pressure and volume when
accelerating versus just idling, so that might be the only
warning you get before total failure.

An OBD scan tool -might- show a lean fuel condition under
acceleration, but not always.
I repaired a 98 Chevy K-1500 last week that had a failing fuel
pump, it had hard starting symptoms a few times in the week
before, on the day the customer drove it to my shop, it started
and ran fine, I scanned it on a test drive at the end of the day
and everything looked fine fuel wise, high O2 sensor volts on
acceleration, normal fuel trim on acceleration, the next morning,
it was a no start with zero fuel pressure, I rapped the fuel tank
with a rubber mallet and then had 30 PSI of fuel pressure, still
half of what is called for in the specs.
In my opinion, a fuel pressure gauge would be more useful in
diagnosing your problem and a whole lot cheaper than a scan tool.