Mechanics

CAR STUMBLES AT ACCELERATION

2000 Chevrolet Impala • 6 cylinder FWD Automatic • 80,000 miles

Car stumbles from dead stop. Does not trip any codes. I have replaced almost every sensor including plugs and wires with no effect. Any suggestions.
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LARRY MONTGOMERY
April 8, 2011.



When was last tune-up?

Could be one of the following below: Oxygen sensor.

Catalytic converter.

Fuel injectors dirty/sticking.

Mass airflow sensor/Airflow meter.

Throttle position sensor.

Manifold absolute pressure sensor.

EGR Valve

Fuel pressure regulator leaking or defective fuel pump.

False air leakage.

Fuel contamination.

Foul/defective spark plugs.

Open spark plug wires.

Ignition coil/Coil packs defective.

Incorrect ignition timing.

Cap and rotor.

Note: If it doesn't apply disregard

Rasmataz
Apr 8, 2011.
Use carburetor cleaner to clean the throttle body (inside where the throttle plates are) and the idle air control solenoid.

Freemba
Apr 8, 2011.