Fuel System Issues:
* Bad Spark Plugs or Wires: Worn-out spark plugs or damaged wires can prevent proper combustion, leading to sputtering.
* Dirty Fuel Filter: A clogged fuel filter restricts fuel flow to the engine, causing sputtering, especially under acceleration.
* Fuel Pump Issues: A failing fuel pump may not deliver enough fuel at higher engine speeds, resulting in sputtering. This is more likely to happen under heavy acceleration.
* Clogged Fuel Injectors: Clogged injectors prevent the proper delivery of fuel, leading to uneven combustion and sputtering.
* Low Fuel Pressure: Problems with the fuel pressure regulator can lead to insufficient fuel pressure.
* Bad Fuel: Using low-quality fuel can cause problems.
Ignition System Issues:
* Ignition Coil Problems: A failing ignition coil can cause misfires in one or more cylinders, leading to sputtering.
* Distributor Cap and Rotor (if applicable): Older Tahoes might have a distributor; worn components here can interrupt the spark.
Other Potential Issues:
* Mass Airflow Sensor (MAF) Problems: A dirty or faulty MAF sensor provides inaccurate air readings to the engine's computer, leading to poor fuel mixture and sputtering.
* Throttle Position Sensor (TPS) Issues: A malfunctioning TPS can cause incorrect fuel delivery.
* Oxygen Sensor (O2 Sensor) Problems: A faulty O2 sensor can disrupt the air/fuel mixture.
* Vacuum Leaks: Leaks in the vacuum system can disrupt engine performance.
* Transmission Problems (Less Likely): While less common, transmission issues *could* manifest as sputtering during acceleration, especially if it's related to torque converter slippage.
* Computer Issues (ECM/PCM): A faulty engine control module can cause a variety of problems, including sputtering.
Troubleshooting Steps (Do these at your own risk; if unsure, see a mechanic):
1. Check Engine Light: If the check engine light is on, get the diagnostic trouble codes (DTCs) read at an auto parts store (often free) or a mechanic. This will give you a starting point.
2. Inspect Spark Plugs and Wires: Visually inspect them for wear and tear. Consider replacing them if they look damaged.
3. Check Fuel Filter: This is relatively easy to access and replace.
4. Listen for unusual noises: Any unusual clicking, whining, or humming sounds can indicate a problem with the fuel pump or other components.
Important Note: Attempting to fix these problems yourself without experience can be dangerous. If you're not comfortable working on your vehicle, take it to a qualified mechanic for diagnosis and repair. Ignoring the problem could lead to further damage.
