Why does your 1985 SE burn rich idle slow gallops gets poor mileage smells of gas and another burnt smell even after replacing all electrical parts wires coils etc?

1. Vacuum leaks:

- Check all vacuum lines and connections for cracks, loose fittings, or disconnection.

-Vacuum leaks can cause the engine to run rich and create the other symptoms you mentioned.

2. Faulty Oxygen sensor:

- The oxygen sensor monitors the exhaust gas and adjusts the fuel mixture accordingly.

- If it's faulty, the engine may run rich to compensate for a perceived lack of oxygen in the exhaust, resulting in poor mileage and exhaust odor.

3. Clogged or faulty fuel injector:

- A clogged or faulty injector can cause the engine to run rich by delivering too much fuel.

- Have the injectors inspected and cleaned or replaced as necessary.

4. Faulty fuel pressure regulator:

- Check and ensure the proper pressure is being maintained.

- A faulty regulator can cause over pressurization, resulting in a rich fuel mixture and symptoms you've mentioned.

5. Incorrect ignition timing:

- Verify the ignition timing is set correctly.

- Incorrect timing can cause the engine to run inefficiently, resulting in rich conditions, poor mileage, and exhaust odors.

6. Faulty coolant temperature sensor:

- The sensor relays the engine's temperature to the ECU, which adjusts the fuel mixture accordingly.

- If faulty, it may provide incorrect readings, causing the engine to run rich.

7. Damaged/Worn spark plugs/wire:

- Ensure that the spark plugs and wires are in good condition.

- Faulty spark or worn-out plugs and wires can lead to incomplete combustion, resulting in the smell of gas and rich conditions.

8. Catalytic converter issues:

- Catalytic converters can become clogged or damaged, affecting exhaust flow and causing the symptoms you described.

9. Check for exhaust leaks before the oxygen sensor:

- Exhaust leaks before the sensor can cause false readings and affect fuel mixture adjustments.

10. ECU errors:

- The Engine Control Unit (ECU) may have issues if electrical component replacements were not done correctly or if the vehicle wiring was damaged.

11. Check PCV system:

- Ensure the system is functioning correctly, as a faulty Positive Crankcase Ventilation (PCV) valve can cause the engine to run rich.

12. Check engine's mechanical health:

- Perform a compression and leak-down test to ensure that the engine's mechanical components, piston rings, and valves are functioning correctly.

* If you have already replaced all electrical parts, the issue is more likely related to fuel delivery, mixture, exhaust system, or mechanical issues.

* It may be best to take the vehicle to a reputable mechanic or auto repair shop for diagnosis and repairs.