Engine Hesitates Or Accelerates Poorly

Check clutch operation.
Ensure emergency brake does not drag when released.
Inspect crankshaft position sensor circuit.
Check battery voltage and charging system.
Verify correct throttle position sensor adjustment and resistance.
Inspect IAT circuit and output.
Ensure fuel is of good quality.
Ensure fuel system pressure is correct.
Ensure fuel injector operation is correct.
Ensure EGR valve and system operation is correct.
Ensure sufficient spark is available at all cylinders.
Ensure spark plugs are not worn out and are gapped properly.
Ensure ignition and valve timing are correct.
Ensure ECM has correct voltage supply and is properly grounded.
Test coolant temperature sensor operation.
Inspect mass/volume airflow sensor.