* Fuel System Problems: This is a strong possibility given your gas loss.
* Fuel Pump: A failing fuel pump can't deliver enough fuel pressure, especially under load (acceleration). This would explain the sputtering and dying, particularly when accelerating through the gears. A weak pump might also explain the rapid gas loss if fuel is leaking back into the tank.
* Fuel Filter: A clogged fuel filter restricts fuel flow, causing similar symptoms.
* Fuel Injectors: Clogged or faulty fuel injectors can deliver an inconsistent or insufficient amount of fuel to the engine.
* Fuel Pressure Regulator: A malfunctioning regulator could either deliver too much or too little fuel pressure.
* Ignition System Problems:
* Distributor Cap and Rotor: Worn or damaged components in the distributor can cause misfires, leading to sputtering and stalling. This is especially common on older vehicles.
* Spark Plugs and Wires: Worn or damaged spark plugs and wires can prevent a good spark, leading to poor combustion.
* Ignition Coil: A failing ignition coil can't generate enough voltage to fire the spark plugs effectively.
* Engine Problems:
* Carburetor (if applicable): If your '91 Spirit has a carburetor (less likely, but possible), it might be dirty, adjusted improperly, or have internal issues. These would cause similar problems to fuel injection issues.
* Mass Airflow Sensor (MAF) or Throttle Position Sensor (TPS): These sensors tell the engine's computer how much air is entering and the throttle position. Malfunctioning sensors will cause the computer to send the wrong fuel mixture, leading to sputtering and stalling.
* Other Possible Issues:
* Vacuum Leaks: Leaks in the vacuum system can disrupt the proper functioning of various engine components, leading to erratic performance.
* Catalytic Converter: A clogged catalytic converter will restrict exhaust flow, causing the engine to struggle and potentially stall. However, this is less likely to cause the specific symptoms you describe.
What to do:
1. Check for obvious fuel leaks: Look carefully around the fuel tank, lines, and injectors for any signs of leakage.
2. Check the fuel pressure: You'll need a fuel pressure gauge to do this. This is the most important step to rule out fuel system problems. A mechanic can easily do this.
3. Inspect the spark plugs and wires: Check for wear, damage, or carbon buildup.
4. Have a mechanic perform a diagnostic test: This is crucial. A scan tool can read fault codes from the engine's computer, which can point to the source of the problem.
5. Consider the age of the car: Given it's a 1991 model, many components are likely nearing the end of their lifespan. Multiple issues are possible.
Don't continue driving the car excessively with these problems. It could cause further damage. Get it diagnosed and repaired by a qualified mechanic as soon as possible. Ignoring the rapid gas loss could indicate a potentially dangerous leak.
