Engine Misfires Or Hesitates

Ensure vacuum hoses are not disconnected or damaged.
Ensure electrical harness connectors and wires are not broken or loose.
Ensure fuel pressure is correct.
Check Throttle Position (TP) sensor operation.
Check Mass Airflow (MAF) sensor.
Check Engine Coolant Temperature (ECT) sensor operation.
Check Heated Oxygen Sensor (HO2S) voltage output.