- Worn-out spark plugs
- Fouled spark plugs
- Incorrect spark plug gap
- Loose spark plug wires
- Faulty ignition coil
2. Fuel Injector Issues
- Clogged fuel injector
- Faulty fuel injector
- Leaking fuel injector
3. Compression Problems
- Worn piston rings
- Damaged valves
- Leaking head gasket
4. Air/Fuel Mixture Issues
- Vacuum leaks
- Faulty oxygen sensor
- Faulty mass air flow sensor
5. Mechanical Issues
- Timing belt/chain problems
- Worn camshaft
- Damaged rocker arm
- Bent pushrod
6. Computer Issues
- Faulty engine control module (ECM)
- Software issues
- Faulty wiring
