1985 Buick Century hesitation when accelerating

1985 BUICK CENTURY
67,000 MILES • 6 CYL • 2WD • AUTOMATIC
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JMCADAMS
  • MEMBER
  • 1 POST
Why does my car have a bad hesitation when I accelerate .I have replaced the following; alternator,distributor rotor and cap,spark plugs and wires, electric fuel pump and fuel filter, rebuilt the carbuerator. The car runs well at 60 + and idles rough after the engine is warm.
Jul 8, 2010 at 2:52 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Possibilities: Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft 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
Jul 8, 2010 at 3:20 PM
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