Engine Hesitation

Check fuel pressure.
Check fuel pressure regulator.
Check ignition system.
Check intake system for leaks.
Check DME relay.
Check oxygen sensor and circuit.
Check full throttle switch and circuit.
Check intake air temperature sensor and circuit.
Check engine coolant temperature sensor and circuit.
Check engine speed/reference mark sensor and circuit.
Check MAF sensor and circuit.
Check Hall Effect sensor and circuit.
Check knock sensors and circuits.
Check fuel injector(s) and circuit(s).
Check DME control unit (knock control).