Sorry for the late update.
The OBD 2 scanner that I ordered has arrived and I scanned my unit.
I already found the culprit because of the fault code that appeared on the scanner.
1. Intake Sensor - Pin is bent, thus, no proper connection
2. Crankshaft Sensor - Unplugged.
REMEDY
1. straighten the pin then reconnected it. No more fault code
2. Plugged the sensor. No more fault code.
Car is now repaired and running but I discovered more fault codes during scanning.
Will replace the needed parts as soon as I have time because currently, I can still use the car even with the fault codes.
Other Codes: O2 Sensor A & B