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Acceleration issues

Tiny
MARIOS
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • V8
  • 4WD
  • AUTOMATIC
  • 82,000 MILES
My 2000 pontiac grand prix GT car has slow acceleration and rpms rev between 1500 and 2000 it hesitates a little than jumps with a burst of power but not for long. I already got a tune up and cat converter was changed. Also had the fuel system flushed and throttle body cleaned. It seems my fuel system may be to blame but no codes or misfires show up. Please someone help
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Friday, July 15th, 2011 AT 10:39 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be one of the following w/o a code/s

Possibilities here:

could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
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 it and keep testing.
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Friday, July 15th, 2011 AT 10:55 PM

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