Most Likely Culprits:
* Crankshaft Position Sensor (CKP Sensor): This is a very common cause. The CKP sensor tells the computer the engine's rotational speed and position. A failing sensor can provide intermittent or incorrect signals, leading to the engine stalling. The engine might restart because the sensor might briefly work again after it cools down or the engine position changes.
* Mass Airflow Sensor (MAF Sensor): The MAF sensor measures the amount of air entering the engine. A faulty MAF sensor can give inaccurate readings, causing the engine to run lean or rich, leading to stalling. Like the CKP, an intermittent problem could cause the symptoms you describe.
* Ignition System Problems: This is a broader category that includes:
* Ignition Coil: A failing ignition coil can cause misfires and stalling, especially under load.
* Spark Plug Wires: Cracked or worn spark plug wires can lead to misfires and intermittent stalling. Check for cracks, arcing, or poor connections.
* Distributor Cap and Rotor (if applicable): Though less likely on a '95 (some had distributorless ignition), check for cracks, corrosion, or wear if your model uses a distributor.
* Fuel System Issues:
* Fuel Pump: A failing fuel pump can deliver inconsistent fuel pressure, causing the engine to starve for fuel and stall. Check fuel pressure.
* Fuel Filter: A clogged fuel filter can restrict fuel flow, leading to similar problems.
* Wiring Problems: Corrosion, loose connections, or damaged wiring harnesses can interrupt signals to crucial components, causing intermittent stalling. Check all connections, particularly those related to the ignition system and sensors.
* Alternator: While less likely to cause a complete shutoff, a failing alternator can lead to voltage drops that affect the engine's electronic systems. Check the alternator's output voltage.
Troubleshooting Steps:
1. Check Engine Light (CEL): Does the CEL illuminate when the problem occurs or afterward? If so, get the codes read using an OBD-II scanner. This will give you valuable clues.
2. Visual Inspection: Look for any obvious signs of damage to wiring, connectors, or components.
3. Start with the CKP Sensor: This is often the easiest and cheapest part to replace, and the most likely culprit given your description.
4. Test the MAF Sensor: You can try cleaning the MAF sensor with MAF sensor cleaner (following instructions carefully), but a replacement might be necessary.
5. Check Fuel Pressure: A gauge is needed for this, and it is best done by a mechanic unless you are experienced with fuel systems.
6. Inspect the Ignition System: Visually check spark plug wires, the distributor (if equipped), and the ignition coil for damage.
7. Professional Diagnosis: If you're not comfortable with automotive diagnostics, take your Mustang to a qualified mechanic. They have the tools and expertise to properly diagnose the issue efficiently.
Important Notes:
* Safety First: Never work on your car while the engine is running or the key is in the "on" position. Disconnect the battery's negative terminal if necessary.
* Intermittent Problems are Tricky: These types of issues are notoriously difficult to diagnose because they don't always occur consistently. The more information you can provide a mechanic (e.g., conditions when it stalls, engine RPM, etc.), the better.
Don't just start throwing parts at the problem; systematic troubleshooting will save you time and money. Start with the most likely culprits (CKP sensor, MAF sensor) and work your way down the list. Good luck!
