Suggest to repair at workshop, usual keypoints of diagnose are:
1. Check the car ignition system and start up wiring.
2. Check the socket connecting condition, power supply wire and grounding cable is it normal. Identify the ECU model use by the system and read the data to perform diagnosis.
3. Dismantle the engine to perform a thorough inspection.
4. Clean the throttle body carbon deposit, reset the throttle body setting.
5. Check the spark plug and ignition coil.
6. Check if hoses of intake system is it clogged or broken, clean the carbon deposit in intake system.
7. Check if the fuel supply hose, fuel filter, carburetor is faulty. Replace the bad quality fuel.
8. Check if the exhaust pipe and catalytic converter is it leakage or broken.
9. Check the O2 sensor, replace if necessary.