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1994 GMC Vandura 2500 quick hard acceleration caused engine to sputter out but slow would allow speed of 50 mph replaced air and fuel filter ran before those repairs now dead help?

Here are a few things to consider:

1. Fuel Pump: Check the fuel pump to ensure it is providing sufficient fuel to the engine. A failing fuel pump can cause the engine to sputter and lose power under acceleration.

2. Spark Plugs and Wires: Check the condition of the spark plugs and spark plug wires. Worn or faulty spark plugs and wires can cause misfires, leading to sputtering and loss of power.

3. Fuel Pressure Regulator: Check the fuel pressure regulator. A faulty fuel pressure regulator can cause the fuel pressure to drop under acceleration, leading to engine sputtering.

4. Throttle Position Sensor: Check the throttle position sensor (TPS). A faulty TPS can send incorrect signals to the engine's computer, causing the engine to sputter under acceleration.

5. Catalytic Converter: Check the catalytic converter for any clogs or blockages. A clogged catalytic converter can restrict the flow of exhaust gases, causing engine sputtering and loss of power.

6. Computer: There could be a problem with the vehicle's computer (ECU). A faulty computer can cause all kinds of problems including sputtering and stalling.