Check the injector pump and the fuel pump. If they are working and free of clogs, check the fuel lines. They rarely have a problem, but it's a good idea to inspect them anyway. Also make sure the fuel filter is allowing the fuel to flow.
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Try a new Fuel filter, or a new fuel pressure regulator. Also check if the fuel pump is working, it could be electrical. Usually you can hear the pump buzzing if you're close to it.
COULD BE A LOT OF THINGS, CHECK TO SEE IF ANY TROUBLE CODES HAVE BEEN SET BY SHORTING THE 2 UPPER LEVEL RIGHT CONTACTS WHERE THE SAN TOOL PLUGS INTO, UNDERNEATH DRIVERS SIDE TO THE RIGHT OF STEERING...
a fuel injector is an electronically controled fuel releser the fires a small mist of fuel into the air manifold just prior to entering the combustion chamber.. a proper fuel to air ratio is 14 parts...