* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's rotational speed. A faulty CKP can provide inaccurate information, leading to the engine shutting down when you accelerate (because the computer isn't getting the correct signal to adjust fuel delivery). This is a very common cause of this type of problem.
* Throttle Position Sensor (TPS): This sensor tells the computer the throttle's position. A faulty TPS could be sending incorrect information, causing the engine to cut out when you accelerate. A dirty TPS can also cause similar issues.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor will give incorrect readings, leading to improper fuel delivery, potentially causing the engine to stall under load.
* Fuel Pump: While less likely if it idles, a weak fuel pump might not be able to supply enough fuel under increased demand (when you accelerate). You might hear a weaker-than-usual humming from the fuel pump.
* Fuel Filter: A clogged fuel filter restricts fuel flow. Similar to a weak pump, this would likely cause problems under load.
* Ignition System (less likely): A problem with the ignition coils, spark plugs, or wires could cause a misfire under load, but it's less likely to be the sole cause if it idles fine. A failing ignition control module is also possible but less frequent.
* Vacuum Leaks: A significant vacuum leak can cause erratic engine behavior, including stalling under load.
* Computer/PCM Issues (ECM): While less common, a problem with the Powertrain Control Module (PCM) could cause this issue.
Troubleshooting Steps:
1. Check for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to read any stored trouble codes. This is the first and most important step. The codes will often point directly to the failing component.
2. Inspect the Throttle Body: Ensure it's clean and free of obstructions. A dirty throttle body can affect the TPS readings.
3. Check the MAF Sensor: Inspect the MAF sensor for dirt or debris. You can carefully clean it with MAF sensor cleaner (following the instructions carefully).
4. Listen for Fuel Pump: With the ignition on (but not running), listen near the fuel tank for the fuel pump's prime. A weak hum or no hum could indicate a failing pump.
Important Note: While some of these components can be checked relatively easily, others require more specialized tools and knowledge. If you're not comfortable working on your vehicle's systems, it's best to take it to a qualified mechanic for diagnosis and repair. Ignoring the problem could lead to further damage.
