Buy or borrow a fuel pressure tester and hook it up to the test point on the fuel rail. Should be like 40-45 PSI.
If fuel pressure is good and you still think it's fuel starved, then pull the rail and check the injectors. They could be gunked up and in need of a cleaning or replacement.
If fuel pressure is bad, then you've got the fuel pump, fuel pump relays/wiring, fuel filter, pressure regulator, or a leak somewhere as possible causes.