* Idle Air Control Valve (IACV): This valve regulates the air entering the engine at idle. If it's dirty or malfunctioning, the engine might not get enough air to stay running when the load from the transmission is removed (when you engage the clutch). Cleaning the IACV is often a cheap and effective first step.
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is. A failing CKP can cause erratic idling and stalling, especially under load changes.
* Throttle Position Sensor (TPS): This sensor tells the engine's computer the throttle position. A faulty TPS can give incorrect readings, leading to improper fuel delivery and stalling, particularly at low speeds.
* Vacuum Leaks: A leak in the vacuum system can disrupt the engine's idle and cause stalling. Check all vacuum hoses for cracks or disconnections. Pay particular attention to hoses connected to the brake booster and the intake manifold.
* Dirty or Failing Fuel Filter: While less likely to cause stalling *only* when engaging the clutch at low speed, a clogged fuel filter can restrict fuel flow, especially when the engine's demands are changing.
* Battery/Alternator: A weak battery or failing alternator can cause voltage drops, leading to erratic engine behavior and stalling. Check your battery voltage and have your alternator tested.
* Clutch Cable/Hydraulics (Less Likely): While the stalling happens *when* you engage the clutch, it's less likely the direct *cause* unless there's an unusual interaction with the engine's systems. A slipping clutch might cause different symptoms.
Troubleshooting Steps:
1. Check Engine Light: Is the check engine light on? Get the codes read using an OBD-II scanner (though 1994 might not be fully OBD-II compliant, it might still have diagnostic codes accessible).
2. Clean the IACV: This is the easiest and cheapest thing to try first. Locate the IACV (usually near the throttle body), disconnect it, and clean it with carb cleaner.
3. Inspect Vacuum Hoses: Carefully examine all vacuum hoses for cracks, leaks, or disconnections.
4. Check Battery and Alternator: Test the battery voltage and have the alternator tested at an auto parts store.
5. Consider professional diagnostics: If the problem persists after checking the above, take your car to a mechanic for professional diagnostics. They can use more advanced tools to test the CKP, TPS, and other sensors.
Remember safety first. If the car is stalling unexpectedly, it's best not to drive it until the problem is diagnosed and repaired.
