- Clogged fuel filter
- Faulty fuel pump
- Dirty fuel injectors
- Faulty fuel pressure regulator
2. Ignition System Problems
- Bad spark plugs
- Faulty spark plug wires
- Defective ignition coil
- Bad ignition module
- Broken timing belt or chain
3. Air/Intake Problems
- Clogged air filter
- Faulty mass air flow sensor (MAF)
- Vacuum leaks
4. Electrical Problems
- Bad battery
- Loose or corroded battery cables
- Faulty starter
- Broken electrical connections
5. Engine Mechanical Problems
- Compression issues
- Piston ring failure
- Worn camshaft or crankshaft bearings