1. Check Engine Light: If the check engine light is on, use an OBD-II scanner to retrieve error codes.
2. Inspect Spark Plugs: Remove and inspect spark plugs for wear or fouling. Replace if necessary.
3. Clean Fuel Injectors: Use a fuel injector cleaner or have them professionally cleaned.
4. Check Air Filter: Ensure the air filter is clean and replace it if it's clogged.

Examine Fuel Pump: Listen for unusual noises from the fuel pump and test fuel pressure.

1. Check Fuses: Inspect and replace any blown fuses related to the AC or heater system.
2. Inspect AC Refrigerant: Verify refrigerant levels and add if necessary.
3. Examine Cabin Air Filter: Replace the cabin air filter if it’s clogged.
4. Test Climate Control Switches: Ensure that climate control switches are functioning correctly.

Check for Leaks: Look for any refrigerant leaks in the AC system.

1. Inspect Fuses and Relays: Check for any blown fuses or faulty relays and replace them as needed.
2. Examine Wiring: Look for damaged or loose wiring connections.
3. Test Battery Voltage: Ensure the battery is fully charged and in good condition.
4. Check Alternator: Test the alternator’s output to ensure it’s charging the battery properly.

Reset Electrical System: Disconnect the battery for a few minutes to reset the electrical system.

1. Inspect Fuel Filter: Check and replace the fuel filter if it’s clogged.
2. Clean Fuel Injectors: Use a fuel injector cleaner or have them serviced.
3. Check for Fuel Leaks: Inspect the fuel lines and connections for leaks.
4. Examine the Fuel Pump: Ensure the fuel pump is operating correctly and delivering adequate pressure.

Test the Fuel Pressure Regulator: Ensure the fuel pressure regulator is maintaining proper fuel pressure.

1. Inspect Shock Absorbers: Check for leaks or wear in the shock absorbers and replace if needed.
2. Examine Suspension Bushings: Look for worn or damaged bushings and replace them.
3. Check for Misalignment: Ensure the wheels are properly aligned.
4. Inspect Struts and Springs: Check for any damage or wear in the struts and springs.

Test the Suspension Components: Perform a thorough check of all suspension components for proper functioning.