Fuel System:
* Fuel Pump: A weak or failing fuel pump might not provide sufficient pressure to the engine, especially under load (like acceleration). Listen for the fuel pump whirring when you turn the key to the "on" position (before cranking). If you don't hear it, or it sounds weak, the pump is a strong suspect.
* Fuel Filter: A clogged fuel filter restricts fuel flow, causing similar symptoms. This is a relatively inexpensive and easy part to replace.
* Fuel Pressure Regulator: A faulty regulator might not maintain proper fuel pressure, leading to inconsistent performance and stalling.
* Clogged Fuel Injectors: Dirty injectors can prevent adequate fuel delivery. This often requires professional cleaning or replacement.
Ignition System:
* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's rotational position. A faulty CKP can cause misfires and stalling, particularly during acceleration.
* Distributor (if applicable): Older Tahoes might have distributors. Issues within the distributor (rotor, cap, wires) can cause misfires and stalling.
* Ignition Coil: A weak or failing coil won't provide sufficient spark to ignite the fuel-air mixture.
* Ignition Switch: A failing ignition switch might not be providing consistent power to the system.
Other Potential Issues:
* Throttle Position Sensor (TPS): The TPS tells the computer the throttle's position. A faulty TPS can lead to erratic engine behavior.
* Mass Airflow Sensor (MAF): The MAF measures the amount of air entering the engine. A dirty or faulty MAF can cause the engine to run lean or rich, leading to stalling.
* Transmission Issues: While less likely to cause the engine to *completely* cut out, transmission problems can cause a sudden loss of power during acceleration. Check for transmission fluid level and condition.
* Vacuum Leaks: A leak in the vacuum system can disrupt engine timing and fuel delivery.
Troubleshooting Steps:
1. Check for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner (available at most auto parts stores) to read any stored trouble codes. These codes can point directly to the problem. Keep in mind that a 1995 Tahoe may not be fully OBD-II compliant, limiting code availability.
2. Listen for the Fuel Pump: As mentioned above, listen for the pump whirring when you turn the key on.
3. Check Fuel Filter: If easily accessible, visually inspect the filter for obvious clogs. Replacement is generally recommended as part of routine maintenance.
4. Inspect Ignition System Components: Look for any obvious signs of damage or wear on the ignition coil, wires, distributor cap, and rotor (if applicable).
5. Check Engine Fluids: Ensure that the engine oil and coolant levels are correct. Low oil can cause serious engine damage.
Important Note: If you are not comfortable working on your vehicle yourself, take it to a qualified mechanic for diagnosis and repair. Improperly diagnosing and repairing automotive issues can be dangerous.
This information provides a starting point for troubleshooting. The specific cause will require careful investigation and potentially professional assistance. The DTCs, if any, will be your best guide.
